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Simplifying 138 = x + (x + -6) Reorder the terms: 138 = x + (-6 + x) Remove parenthesis around (-6 + x) 138 = x + -6 + x Reorder the terms: 138 = -6 + x + x Combine like terms: x + x = 2x 138 = -6 + 2x Solving 138 = -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. 138 + -2x = -6 + 2x + -2x Combine like terms: 2x + -2x = 0 138 + -2x = -6 + 0 138 + -2x = -6 Add '-138' to each side of the equation. 138 + -138 + -2x = -6 + -138 Combine like terms: 138 + -138 = 0 0 + -2x = -6 + -138 -2x = -6 + -138 Combine like terms: -6 + -138 = -144 -2x = -144 Divide each side by '-2'. x = 72 Simplifying x = 72
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