129-7x=8x+21

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Solution for 129-7x=8x+21 equation:


Simplifying
129 + -7x = 8x + 21

Reorder the terms:
129 + -7x = 21 + 8x

Solving
129 + -7x = 21 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
129 + -7x + -8x = 21 + 8x + -8x

Combine like terms: -7x + -8x = -15x
129 + -15x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
129 + -15x = 21 + 0
129 + -15x = 21

Add '-129' to each side of the equation.
129 + -129 + -15x = 21 + -129

Combine like terms: 129 + -129 = 0
0 + -15x = 21 + -129
-15x = 21 + -129

Combine like terms: 21 + -129 = -108
-15x = -108

Divide each side by '-15'.
x = 7.2

Simplifying
x = 7.2

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