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Simplifying -1(x + -3) = -4x + 12 Reorder the terms: -1(-3 + x) = -4x + 12 (-3 * -1 + x * -1) = -4x + 12 (3 + -1x) = -4x + 12 Reorder the terms: 3 + -1x = 12 + -4x Solving 3 + -1x = 12 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 3 + -1x + 4x = 12 + -4x + 4x Combine like terms: -1x + 4x = 3x 3 + 3x = 12 + -4x + 4x Combine like terms: -4x + 4x = 0 3 + 3x = 12 + 0 3 + 3x = 12 Add '-3' to each side of the equation. 3 + -3 + 3x = 12 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 12 + -3 3x = 12 + -3 Combine like terms: 12 + -3 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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