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Simplifying 18 = 3(x + -1) + -1(x + -9) Reorder the terms: 18 = 3(-1 + x) + -1(x + -9) 18 = (-1 * 3 + x * 3) + -1(x + -9) 18 = (-3 + 3x) + -1(x + -9) Reorder the terms: 18 = -3 + 3x + -1(-9 + x) 18 = -3 + 3x + (-9 * -1 + x * -1) 18 = -3 + 3x + (9 + -1x) Reorder the terms: 18 = -3 + 9 + 3x + -1x Combine like terms: -3 + 9 = 6 18 = 6 + 3x + -1x Combine like terms: 3x + -1x = 2x 18 = 6 + 2x Solving 18 = 6 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 18 + -2x = 6 + 2x + -2x Combine like terms: 2x + -2x = 0 18 + -2x = 6 + 0 18 + -2x = 6 Add '-18' to each side of the equation. 18 + -18 + -2x = 6 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 6 + -18 -2x = 6 + -18 Combine like terms: 6 + -18 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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