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Simplifying (12 + -1x) + -1(3x + 4) = -1x + -1 Remove parenthesis around (12 + -1x) 12 + -1x + -1(3x + 4) = -1x + -1 Reorder the terms: 12 + -1x + -1(4 + 3x) = -1x + -1 12 + -1x + (4 * -1 + 3x * -1) = -1x + -1 12 + -1x + (-4 + -3x) = -1x + -1 Reorder the terms: 12 + -4 + -1x + -3x = -1x + -1 Combine like terms: 12 + -4 = 8 8 + -1x + -3x = -1x + -1 Combine like terms: -1x + -3x = -4x 8 + -4x = -1x + -1 Reorder the terms: 8 + -4x = -1 + -1x Solving 8 + -4x = -1 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 8 + -4x + x = -1 + -1x + x Combine like terms: -4x + x = -3x 8 + -3x = -1 + -1x + x Combine like terms: -1x + x = 0 8 + -3x = -1 + 0 8 + -3x = -1 Add '-8' to each side of the equation. 8 + -8 + -3x = -1 + -8 Combine like terms: 8 + -8 = 0 0 + -3x = -1 + -8 -3x = -1 + -8 Combine like terms: -1 + -8 = -9 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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