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Simplifying -13 = -1(x + 9) Reorder the terms: -13 = -1(9 + x) -13 = (9 * -1 + x * -1) -13 = (-9 + -1x) Solving -13 = -9 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -13 + x = -9 + -1x + x Combine like terms: -1x + x = 0 -13 + x = -9 + 0 -13 + x = -9 Add '13' to each side of the equation. -13 + 13 + x = -9 + 13 Combine like terms: -13 + 13 = 0 0 + x = -9 + 13 x = -9 + 13 Combine like terms: -9 + 13 = 4 x = 4 Simplifying x = 4
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