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Simplifying (8x + -9) + (7x + 9) = 90 Reorder the terms: (-9 + 8x) + (7x + 9) = 90 Remove parenthesis around (-9 + 8x) -9 + 8x + (7x + 9) = 90 Reorder the terms: -9 + 8x + (9 + 7x) = 90 Remove parenthesis around (9 + 7x) -9 + 8x + 9 + 7x = 90 Reorder the terms: -9 + 9 + 8x + 7x = 90 Combine like terms: -9 + 9 = 0 0 + 8x + 7x = 90 8x + 7x = 90 Combine like terms: 8x + 7x = 15x 15x = 90 Solving 15x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '15'. x = 6 Simplifying x = 6
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