ln(7x)=ln(40-x)

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Solution for ln(7x)=ln(40-x) equation:


Simplifying
ln(7x) = ln(40 + -1x)

Remove parenthesis around (7x)
ln * 7x = ln(40 + -1x)

Reorder the terms for easier multiplication:
7ln * x = ln(40 + -1x)

Multiply ln * x
7lnx = ln(40 + -1x)
7lnx = (40 * ln + -1x * ln)
7lnx = (40ln + -1lnx)

Solving
7lnx = 40ln + -1lnx

Solving for variable 'l'.

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

Add '-40ln' to each side of the equation.
-40ln + 7lnx = 40ln + -40ln + -1lnx

Combine like terms: 40ln + -40ln = 0
-40ln + 7lnx = 0 + -1lnx
-40ln + 7lnx = -1lnx

Add 'lnx' to each side of the equation.
-40ln + 7lnx + lnx = -1lnx + lnx

Combine like terms: 7lnx + lnx = 8lnx
-40ln + 8lnx = -1lnx + lnx

Combine like terms: -1lnx + lnx = 0
-40ln + 8lnx = 0

Factor out the Greatest Common Factor (GCF), '8ln'.
8ln(-5 + x) = 0

Ignore the factor 8.

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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