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Simplifying 15m + -1(7 + -3m) = m + -21 15m + (7 * -1 + -3m * -1) = m + -21 15m + (-7 + 3m) = m + -21 Reorder the terms: -7 + 15m + 3m = m + -21 Combine like terms: 15m + 3m = 18m -7 + 18m = m + -21 Reorder the terms: -7 + 18m = -21 + m Solving -7 + 18m = -21 + 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. -7 + 18m + -1m = -21 + m + -1m Combine like terms: 18m + -1m = 17m -7 + 17m = -21 + m + -1m Combine like terms: m + -1m = 0 -7 + 17m = -21 + 0 -7 + 17m = -21 Add '7' to each side of the equation. -7 + 7 + 17m = -21 + 7 Combine like terms: -7 + 7 = 0 0 + 17m = -21 + 7 17m = -21 + 7 Combine like terms: -21 + 7 = -14 17m = -14 Divide each side by '17'. m = -0.8235294118 Simplifying m = -0.8235294118
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