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Simplifying (x2 + -1x + 9) = (x2 + x + 15) Reorder the terms: (9 + -1x + x2) = (x2 + x + 15) Remove parenthesis around (9 + -1x + x2) 9 + -1x + x2 = (x2 + x + 15) Reorder the terms: 9 + -1x + x2 = (15 + x + x2) Remove parenthesis around (15 + x + x2) 9 + -1x + x2 = 15 + x + x2 Add '-1x2' to each side of the equation. 9 + -1x + x2 + -1x2 = 15 + x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + -1x + 0 = 15 + x + x2 + -1x2 9 + -1x = 15 + x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + -1x = 15 + x + 0 9 + -1x = 15 + x Solving 9 + -1x = 15 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 9 + -1x + -1x = 15 + x + -1x Combine like terms: -1x + -1x = -2x 9 + -2x = 15 + x + -1x Combine like terms: x + -1x = 0 9 + -2x = 15 + 0 9 + -2x = 15 Add '-9' to each side of the equation. 9 + -9 + -2x = 15 + -9 Combine like terms: 9 + -9 = 0 0 + -2x = 15 + -9 -2x = 15 + -9 Combine like terms: 15 + -9 = 6 -2x = 6 Divide each side by '-2'. x = -3 Simplifying x = -3
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