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Simplifying -1(x + 9) = x Reorder the terms: -1(9 + x) = x (9 * -1 + x * -1) = x (-9 + -1x) = x Solving -9 + -1x = 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 = x + -1x Combine like terms: -1x + -1x = -2x -9 + -2x = x + -1x Combine like terms: x + -1x = 0 -9 + -2x = 0 Add '9' to each side of the equation. -9 + 9 + -2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = 0 + 9 -2x = 0 + 9 Combine like terms: 0 + 9 = 9 -2x = 9 Divide each side by '-2'. x = -4.5 Simplifying x = -4.5
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