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Simplifying 15 + -42 = 3(x + -1) + -9 Combine like terms: 15 + -42 = -27 -27 = 3(x + -1) + -9 Reorder the terms: -27 = 3(-1 + x) + -9 -27 = (-1 * 3 + x * 3) + -9 -27 = (-3 + 3x) + -9 Reorder the terms: -27 = -3 + -9 + 3x Combine like terms: -3 + -9 = -12 -27 = -12 + 3x Solving -27 = -12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -27 + -3x = -12 + 3x + -3x Combine like terms: 3x + -3x = 0 -27 + -3x = -12 + 0 -27 + -3x = -12 Add '27' to each side of the equation. -27 + 27 + -3x = -12 + 27 Combine like terms: -27 + 27 = 0 0 + -3x = -12 + 27 -3x = -12 + 27 Combine like terms: -12 + 27 = 15 -3x = 15 Divide each side by '-3'. x = -5 Simplifying x = -5
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