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Simplifying (x + 20) = (3x + -42) Reorder the terms: (20 + x) = (3x + -42) Remove parenthesis around (20 + x) 20 + x = (3x + -42) Reorder the terms: 20 + x = (-42 + 3x) Remove parenthesis around (-42 + 3x) 20 + x = -42 + 3x Solving 20 + x = -42 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 20 + x + -3x = -42 + 3x + -3x Combine like terms: x + -3x = -2x 20 + -2x = -42 + 3x + -3x Combine like terms: 3x + -3x = 0 20 + -2x = -42 + 0 20 + -2x = -42 Add '-20' to each side of the equation. 20 + -20 + -2x = -42 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = -42 + -20 -2x = -42 + -20 Combine like terms: -42 + -20 = -62 -2x = -62 Divide each side by '-2'. x = 31 Simplifying x = 31
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