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Simplifying -21 = (m + 4) Reorder the terms: -21 = (4 + m) Remove parenthesis around (4 + m) -21 = 4 + m Solving -21 = 4 + 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. -21 + -1m = 4 + m + -1m Combine like terms: m + -1m = 0 -21 + -1m = 4 + 0 -21 + -1m = 4 Add '21' to each side of the equation. -21 + 21 + -1m = 4 + 21 Combine like terms: -21 + 21 = 0 0 + -1m = 4 + 21 -1m = 4 + 21 Combine like terms: 4 + 21 = 25 -1m = 25 Divide each side by '-1'. m = -25 Simplifying m = -25
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