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Simplifying -13 = m + -1(-7) Multiply -1 * -7 -13 = m + 7 Reorder the terms: -13 = 7 + m Solving -13 = 7 + m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1m' to each side of the equation. -13 + -1m = 7 + m + -1m Combine like terms: m + -1m = 0 -13 + -1m = 7 + 0 -13 + -1m = 7 Add '13' to each side of the equation. -13 + 13 + -1m = 7 + 13 Combine like terms: -13 + 13 = 0 0 + -1m = 7 + 13 -1m = 7 + 13 Combine like terms: 7 + 13 = 20 -1m = 20 Divide each side by '-1'. m = -20 Simplifying m = -20
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