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Simplifying -12(x + -12) = -9(1 + 7) * x Reorder the terms: -12(-12 + x) = -9(1 + 7) * x (-12 * -12 + x * -12) = -9(1 + 7) * x (144 + -12x) = -9(1 + 7) * x Combine like terms: 1 + 7 = 8 144 + -12x = -9(8) * x Multiply -9 * 8 144 + -12x = -72x Solving 144 + -12x = -72x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '72x' to each side of the equation. 144 + -12x + 72x = -72x + 72x Combine like terms: -12x + 72x = 60x 144 + 60x = -72x + 72x Combine like terms: -72x + 72x = 0 144 + 60x = 0 Add '-144' to each side of the equation. 144 + -144 + 60x = 0 + -144 Combine like terms: 144 + -144 = 0 0 + 60x = 0 + -144 60x = 0 + -144 Combine like terms: 0 + -144 = -144 60x = -144 Divide each side by '60'. x = -2.4 Simplifying x = -2.4
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