129=7x-3(x+3)

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Solution for 129=7x-3(x+3) equation:


Simplifying
129 = 7x + -3(x + 3)

Reorder the terms:
129 = 7x + -3(3 + x)
129 = 7x + (3 * -3 + x * -3)
129 = 7x + (-9 + -3x)

Reorder the terms:
129 = -9 + 7x + -3x

Combine like terms: 7x + -3x = 4x
129 = -9 + 4x

Solving
129 = -9 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
129 + -4x = -9 + 4x + -4x

Combine like terms: 4x + -4x = 0
129 + -4x = -9 + 0
129 + -4x = -9

Add '-129' to each side of the equation.
129 + -129 + -4x = -9 + -129

Combine like terms: 129 + -129 = 0
0 + -4x = -9 + -129
-4x = -9 + -129

Combine like terms: -9 + -129 = -138
-4x = -138

Divide each side by '-4'.
x = 34.5

Simplifying
x = 34.5

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