5x+21=15x-99

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Solution for 5x+21=15x-99 equation:


Simplifying
5x + 21 = 15x + -99

Reorder the terms:
21 + 5x = 15x + -99

Reorder the terms:
21 + 5x = -99 + 15x

Solving
21 + 5x = -99 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
21 + 5x + -15x = -99 + 15x + -15x

Combine like terms: 5x + -15x = -10x
21 + -10x = -99 + 15x + -15x

Combine like terms: 15x + -15x = 0
21 + -10x = -99 + 0
21 + -10x = -99

Add '-21' to each side of the equation.
21 + -21 + -10x = -99 + -21

Combine like terms: 21 + -21 = 0
0 + -10x = -99 + -21
-10x = -99 + -21

Combine like terms: -99 + -21 = -120
-10x = -120

Divide each side by '-10'.
x = 12

Simplifying
x = 12

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