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Simplifying 138 = x + 2x + (x + 20) Reorder the terms: 138 = x + 2x + (20 + x) Remove parenthesis around (20 + x) 138 = x + 2x + 20 + x Reorder the terms: 138 = 20 + x + 2x + x Combine like terms: x + 2x = 3x 138 = 20 + 3x + x Combine like terms: 3x + x = 4x 138 = 20 + 4x Solving 138 = 20 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 138 + -4x = 20 + 4x + -4x Combine like terms: 4x + -4x = 0 138 + -4x = 20 + 0 138 + -4x = 20 Add '-138' to each side of the equation. 138 + -138 + -4x = 20 + -138 Combine like terms: 138 + -138 = 0 0 + -4x = 20 + -138 -4x = 20 + -138 Combine like terms: 20 + -138 = -118 -4x = -118 Divide each side by '-4'. x = 29.5 Simplifying x = 29.5
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