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Simplifying -4 + -1(-13) = x Multiply -1 * -13 -4 + 13 = x Combine like terms: -4 + 13 = 9 9 = x Solving 9 = 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 = x + -1x Combine like terms: x + -1x = 0 9 + -1x = 0 Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9
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