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Simplifying (5x + 7) + (2x + -1) = 90 Reorder the terms: (7 + 5x) + (2x + -1) = 90 Remove parenthesis around (7 + 5x) 7 + 5x + (2x + -1) = 90 Reorder the terms: 7 + 5x + (-1 + 2x) = 90 Remove parenthesis around (-1 + 2x) 7 + 5x + -1 + 2x = 90 Reorder the terms: 7 + -1 + 5x + 2x = 90 Combine like terms: 7 + -1 = 6 6 + 5x + 2x = 90 Combine like terms: 5x + 2x = 7x 6 + 7x = 90 Solving 6 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 7x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 7x = 90 + -6 7x = 90 + -6 Combine like terms: 90 + -6 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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