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Simplifying (x + -39) + (x + 67) = 90 Reorder the terms: (-39 + x) + (x + 67) = 90 Remove parenthesis around (-39 + x) -39 + x + (x + 67) = 90 Reorder the terms: -39 + x + (67 + x) = 90 Remove parenthesis around (67 + x) -39 + x + 67 + x = 90 Reorder the terms: -39 + 67 + x + x = 90 Combine like terms: -39 + 67 = 28 28 + x + x = 90 Combine like terms: x + x = 2x 28 + 2x = 90 Solving 28 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 2x = 90 + -28 Combine like terms: 28 + -28 = 0 0 + 2x = 90 + -28 2x = 90 + -28 Combine like terms: 90 + -28 = 62 2x = 62 Divide each side by '2'. x = 31 Simplifying x = 31
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