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Simplifying 3x + -4(3x + -9) = 144 Reorder the terms: 3x + -4(-9 + 3x) = 144 3x + (-9 * -4 + 3x * -4) = 144 3x + (36 + -12x) = 144 Reorder the terms: 36 + 3x + -12x = 144 Combine like terms: 3x + -12x = -9x 36 + -9x = 144 Solving 36 + -9x = 144 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + -9x = 144 + -36 Combine like terms: 36 + -36 = 0 0 + -9x = 144 + -36 -9x = 144 + -36 Combine like terms: 144 + -36 = 108 -9x = 108 Divide each side by '-9'. x = -12 Simplifying x = -12
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