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Simplifying 3x + 3(-4x + -12) = -144 Reorder the terms: 3x + 3(-12 + -4x) = -144 3x + (-12 * 3 + -4x * 3) = -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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