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Simplifying 3(6 + -1x) + -1(18 + x) = 15 (6 * 3 + -1x * 3) + -1(18 + x) = 15 (18 + -3x) + -1(18 + x) = 15 18 + -3x + (18 * -1 + x * -1) = 15 18 + -3x + (-18 + -1x) = 15 Reorder the terms: 18 + -18 + -3x + -1x = 15 Combine like terms: 18 + -18 = 0 0 + -3x + -1x = 15 -3x + -1x = 15 Combine like terms: -3x + -1x = -4x -4x = 15 Solving -4x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-4'. x = -3.75 Simplifying x = -3.75
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