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Simplifying 2x + -1(3 + x) = 12 2x + (3 * -1 + x * -1) = 12 2x + (-3 + -1x) = 12 Reorder the terms: -3 + 2x + -1x = 12 Combine like terms: 2x + -1x = 1x -3 + 1x = 12 Solving -3 + 1x = 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 + 1x = 12 + 3 Combine like terms: -3 + 3 = 0 0 + 1x = 12 + 3 1x = 12 + 3 Combine like terms: 12 + 3 = 15 1x = 15 Divide each side by '1'. x = 15 Simplifying x = 15
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