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Simplifying (2x + 12) + (2x + 31) = 90 Reorder the terms: (12 + 2x) + (2x + 31) = 90 Remove parenthesis around (12 + 2x) 12 + 2x + (2x + 31) = 90 Reorder the terms: 12 + 2x + (31 + 2x) = 90 Remove parenthesis around (31 + 2x) 12 + 2x + 31 + 2x = 90 Reorder the terms: 12 + 31 + 2x + 2x = 90 Combine like terms: 12 + 31 = 43 43 + 2x + 2x = 90 Combine like terms: 2x + 2x = 4x 43 + 4x = 90 Solving 43 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-43' to each side of the equation. 43 + -43 + 4x = 90 + -43 Combine like terms: 43 + -43 = 0 0 + 4x = 90 + -43 4x = 90 + -43 Combine like terms: 90 + -43 = 47 4x = 47 Divide each side by '4'. x = 11.75 Simplifying x = 11.75
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