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Simplifying x2 + -9 = x2 + x + -20 Reorder the terms: -9 + x2 = x2 + x + -20 Reorder the terms: -9 + x2 = -20 + x + x2 Add '-1x2' to each side of the equation. -9 + x2 + -1x2 = -20 + x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 + 0 = -20 + x + x2 + -1x2 -9 = -20 + x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -9 = -20 + x + 0 -9 = -20 + x Solving -9 = -20 + 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 = -20 + x + -1x Combine like terms: x + -1x = 0 -9 + -1x = -20 + 0 -9 + -1x = -20 Add '9' to each side of the equation. -9 + 9 + -1x = -20 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = -20 + 9 -1x = -20 + 9 Combine like terms: -20 + 9 = -11 -1x = -11 Divide each side by '-1'. x = 11 Simplifying x = 11
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