8x+9=3x-21

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Solution for 8x+9=3x-21 equation:


Simplifying
8x + 9 = 3x + -21

Reorder the terms:
9 + 8x = 3x + -21

Reorder the terms:
9 + 8x = -21 + 3x

Solving
9 + 8x = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
9 + 8x + -3x = -21 + 3x + -3x

Combine like terms: 8x + -3x = 5x
9 + 5x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
9 + 5x = -21 + 0
9 + 5x = -21

Add '-9' to each side of the equation.
9 + -9 + 5x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 5x = -21 + -9
5x = -21 + -9

Combine like terms: -21 + -9 = -30
5x = -30

Divide each side by '5'.
x = -6

Simplifying
x = -6

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