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Simplifying -1(x + 9) = -31 Reorder the terms: -1(9 + x) = -31 (9 * -1 + x * -1) = -31 (-9 + -1x) = -31 Solving -9 + -1x = -31 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 + 9 + -1x = -31 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = -31 + 9 -1x = -31 + 9 Combine like terms: -31 + 9 = -22 -1x = -22 Divide each side by '-1'. x = 22 Simplifying x = 22
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