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Simplifying -1(1 + x) + 4 + -4x = -12 (1 * -1 + x * -1) + 4 + -4x = -12 (-1 + -1x) + 4 + -4x = -12 Reorder the terms: -1 + 4 + -1x + -4x = -12 Combine like terms: -1 + 4 = 3 3 + -1x + -4x = -12 Combine like terms: -1x + -4x = -5x 3 + -5x = -12 Solving 3 + -5x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -5x = -12 + -3 Combine like terms: 3 + -3 = 0 0 + -5x = -12 + -3 -5x = -12 + -3 Combine like terms: -12 + -3 = -15 -5x = -15 Divide each side by '-5'. x = 3 Simplifying x = 3
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