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Simplifying 7 + -1(-13) = x Multiply -1 * -13 7 + 13 = x Combine like terms: 7 + 13 = 20 20 = x Solving 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. 20 + -1x = x + -1x Combine like terms: x + -1x = 0 20 + -1x = 0 Add '-20' to each side of the equation. 20 + -20 + -1x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 0 + -20 -1x = 0 + -20 Combine like terms: 0 + -20 = -20 -1x = -20 Divide each side by '-1'. x = 20 Simplifying x = 20
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