ln(8x+9)=ln(2x-21)

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Solution for ln(8x+9)=ln(2x-21) equation:


Simplifying
ln(8x + 9) = ln(2x + -21)

Reorder the terms:
ln(9 + 8x) = ln(2x + -21)
(9 * ln + 8x * ln) = ln(2x + -21)
(9ln + 8lnx) = ln(2x + -21)

Reorder the terms:
9ln + 8lnx = ln(-21 + 2x)
9ln + 8lnx = (-21 * ln + 2x * ln)
9ln + 8lnx = (-21ln + 2lnx)

Solving
9ln + 8lnx = -21ln + 2lnx

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Add '21ln' to each side of the equation.
9ln + 21ln + 8lnx = -21ln + 21ln + 2lnx

Combine like terms: 9ln + 21ln = 30ln
30ln + 8lnx = -21ln + 21ln + 2lnx

Combine like terms: -21ln + 21ln = 0
30ln + 8lnx = 0 + 2lnx
30ln + 8lnx = 2lnx

Add '-2lnx' to each side of the equation.
30ln + 8lnx + -2lnx = 2lnx + -2lnx

Combine like terms: 8lnx + -2lnx = 6lnx
30ln + 6lnx = 2lnx + -2lnx

Combine like terms: 2lnx + -2lnx = 0
30ln + 6lnx = 0

Factor out the Greatest Common Factor (GCF), '6ln'.
6ln(5 + x) = 0

Ignore the factor 6.

Subproblem 1

Set the factor 'ln' equal to zero and attempt to solve: Simplifying ln = 0 Solving ln = 0 Move all terms containing l to the left, all other terms to the right. Simplifying ln = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 0 Move all terms containing l to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Add '-1x' to each side of the equation. x + -1x = -5 + -1x Combine like terms: x + -1x = 0 0 = -5 + -1x Simplifying 0 = -5 + -1x The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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