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Simplifying (8x + 7) + (-9x + 8) = 0 Reorder the terms: (7 + 8x) + (-9x + 8) = 0 Remove parenthesis around (7 + 8x) 7 + 8x + (-9x + 8) = 0 Reorder the terms: 7 + 8x + (8 + -9x) = 0 Remove parenthesis around (8 + -9x) 7 + 8x + 8 + -9x = 0 Reorder the terms: 7 + 8 + 8x + -9x = 0 Combine like terms: 7 + 8 = 15 15 + 8x + -9x = 0 Combine like terms: 8x + -9x = -1x 15 + -1x = 0 Solving 15 + -1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 0 + -15 -1x = 0 + -15 Combine like terms: 0 + -15 = -15 -1x = -15 Divide each side by '-1'. x = 15 Simplifying x = 15
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