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Simplifying (2x + 15) + (5x + -2) = 90 Reorder the terms: (15 + 2x) + (5x + -2) = 90 Remove parenthesis around (15 + 2x) 15 + 2x + (5x + -2) = 90 Reorder the terms: 15 + 2x + (-2 + 5x) = 90 Remove parenthesis around (-2 + 5x) 15 + 2x + -2 + 5x = 90 Reorder the terms: 15 + -2 + 2x + 5x = 90 Combine like terms: 15 + -2 = 13 13 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x 13 + 7x = 90 Solving 13 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 7x = 90 + -13 Combine like terms: 13 + -13 = 0 0 + 7x = 90 + -13 7x = 90 + -13 Combine like terms: 90 + -13 = 77 7x = 77 Divide each side by '7'. x = 11 Simplifying x = 11
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