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Simplifying X + -9 + x + x(x + -2) = 720 Reorder the terms: X + -9 + x + x(-2 + x) = 720 X + -9 + x + (-2 * x + x * x) = 720 X + -9 + x + (-2x + x2) = 720 Reorder the terms: -9 + X + x + -2x + x2 = 720 Combine like terms: x + -2x = -1x -9 + X + -1x + x2 = 720 Solving -9 + X + -1x + x2 = 720 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 + X + -1x + 9 + x2 = 720 + 9 Reorder the terms: -9 + 9 + X + -1x + x2 = 720 + 9 Combine like terms: -9 + 9 = 0 0 + X + -1x + x2 = 720 + 9 X + -1x + x2 = 720 + 9 Combine like terms: 720 + 9 = 729 X + -1x + x2 = 729 Add 'x' to each side of the equation. X + -1x + x + x2 = 729 + x Combine like terms: -1x + x = 0 X + 0 + x2 = 729 + x X + x2 = 729 + x Add '-1x2' to each side of the equation. X + x2 + -1x2 = 729 + x + -1x2 Combine like terms: x2 + -1x2 = 0 X + 0 = 729 + x + -1x2 X = 729 + x + -1x2 Simplifying X = 729 + x + -1x2
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