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Simplifying (18 + -3x) + -1(12 + -1x) = 20 Remove parenthesis around (18 + -3x) 18 + -3x + -1(12 + -1x) = 20 18 + -3x + (12 * -1 + -1x * -1) = 20 18 + -3x + (-12 + 1x) = 20 Reorder the terms: 18 + -12 + -3x + 1x = 20 Combine like terms: 18 + -12 = 6 6 + -3x + 1x = 20 Combine like terms: -3x + 1x = -2x 6 + -2x = 20 Solving 6 + -2x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -2x = 20 + -6 Combine like terms: 6 + -6 = 0 0 + -2x = 20 + -6 -2x = 20 + -6 Combine like terms: 20 + -6 = 14 -2x = 14 Divide each side by '-2'. x = -7 Simplifying x = -7
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