129=5x+3(-7x-9)

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Solution for 129=5x+3(-7x-9) equation:


Simplifying
129 = 5x + 3(-7x + -9)

Reorder the terms:
129 = 5x + 3(-9 + -7x)
129 = 5x + (-9 * 3 + -7x * 3)
129 = 5x + (-27 + -21x)

Reorder the terms:
129 = -27 + 5x + -21x

Combine like terms: 5x + -21x = -16x
129 = -27 + -16x

Solving
129 = -27 + -16x

Solving for variable 'x'.

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

Add '16x' to each side of the equation.
129 + 16x = -27 + -16x + 16x

Combine like terms: -16x + 16x = 0
129 + 16x = -27 + 0
129 + 16x = -27

Add '-129' to each side of the equation.
129 + -129 + 16x = -27 + -129

Combine like terms: 129 + -129 = 0
0 + 16x = -27 + -129
16x = -27 + -129

Combine like terms: -27 + -129 = -156
16x = -156

Divide each side by '16'.
x = -9.75

Simplifying
x = -9.75

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