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Simplifying x2 + -9 = x2 + -8x + 15x Reorder the terms: -9 + x2 = x2 + -8x + 15x Reorder the terms: -9 + x2 = -8x + 15x + x2 Combine like terms: -8x + 15x = 7x -9 + x2 = 7x + x2 Add '-1x2' to each side of the equation. -9 + x2 + -1x2 = 7x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 + 0 = 7x + x2 + -1x2 -9 = 7x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 = 7x + 0 -9 = 7x Solving -9 = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -9 + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 -9 + -7x = 0 Add '9' to each side of the equation. -9 + 9 + -7x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -7x = 0 + 9 -7x = 0 + 9 Combine like terms: 0 + 9 = 9 -7x = 9 Divide each side by '-7'. x = -1.285714286 Simplifying x = -1.285714286
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