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Simplifying 21 = 2(m + -4) + 3 Reorder the terms: 21 = 2(-4 + m) + 3 21 = (-4 * 2 + m * 2) + 3 21 = (-8 + 2m) + 3 Reorder the terms: 21 = -8 + 3 + 2m Combine like terms: -8 + 3 = -5 21 = -5 + 2m Solving 21 = -5 + 2m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2m' to each side of the equation. 21 + -2m = -5 + 2m + -2m Combine like terms: 2m + -2m = 0 21 + -2m = -5 + 0 21 + -2m = -5 Add '-21' to each side of the equation. 21 + -21 + -2m = -5 + -21 Combine like terms: 21 + -21 = 0 0 + -2m = -5 + -21 -2m = -5 + -21 Combine like terms: -5 + -21 = -26 -2m = -26 Divide each side by '-2'. m = 13 Simplifying m = 13
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