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Simplifying (8x + 7) + (9x + -4) = 90 Reorder the terms: (7 + 8x) + (9x + -4) = 90 Remove parenthesis around (7 + 8x) 7 + 8x + (9x + -4) = 90 Reorder the terms: 7 + 8x + (-4 + 9x) = 90 Remove parenthesis around (-4 + 9x) 7 + 8x + -4 + 9x = 90 Reorder the terms: 7 + -4 + 8x + 9x = 90 Combine like terms: 7 + -4 = 3 3 + 8x + 9x = 90 Combine like terms: 8x + 9x = 17x 3 + 17x = 90 Solving 3 + 17x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 17x = 90 + -3 Combine like terms: 3 + -3 = 0 0 + 17x = 90 + -3 17x = 90 + -3 Combine like terms: 90 + -3 = 87 17x = 87 Divide each side by '17'. x = 5.117647059 Simplifying x = 5.117647059
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