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Simplifying 12x + -3(x + -1) = 15 Reorder the terms: 12x + -3(-1 + x) = 15 12x + (-1 * -3 + x * -3) = 15 12x + (3 + -3x) = 15 Reorder the terms: 3 + 12x + -3x = 15 Combine like terms: 12x + -3x = 9x 3 + 9x = 15 Solving 3 + 9x = 15 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 + 9x = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 9x = 15 + -3 9x = 15 + -3 Combine like terms: 15 + -3 = 12 9x = 12 Divide each side by '9'. x = 1.333333333 Simplifying x = 1.333333333
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