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Simplifying (8x + -9) + x = 90 Reorder the terms: (-9 + 8x) + x = 90 Remove parenthesis around (-9 + 8x) -9 + 8x + x = 90 Combine like terms: 8x + x = 9x -9 + 9x = 90 Solving -9 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 9x = 90 + 9 Combine like terms: -9 + 9 = 0 0 + 9x = 90 + 9 9x = 90 + 9 Combine like terms: 90 + 9 = 99 9x = 99 Divide each side by '9'. x = 11 Simplifying x = 11
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