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Simplifying x2 + -2x = x(7 + x) Reorder the terms: -2x + x2 = x(7 + x) -2x + x2 = (7 * x + x * x) -2x + x2 = (7x + x2) Add '-1x2' to each side of the equation. -2x + x2 + -1x2 = 7x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -2x + 0 = 7x + x2 + -1x2 -2x = 7x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -2x = 7x + 0 -2x = 7x Solving -2x = 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. -2x + -7x = 7x + -7x Combine like terms: -2x + -7x = -9x -9x = 7x + -7x Combine like terms: 7x + -7x = 0 -9x = 0 Divide each side by '-9'. x = 0 Simplifying x = 0
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