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Simplifying -21 + -4m = 7(-7m + -3) Reorder the terms: -21 + -4m = 7(-3 + -7m) -21 + -4m = (-3 * 7 + -7m * 7) -21 + -4m = (-21 + -49m) Add '21' to each side of the equation. -21 + 21 + -4m = -21 + 21 + -49m Combine like terms: -21 + 21 = 0 0 + -4m = -21 + 21 + -49m -4m = -21 + 21 + -49m Combine like terms: -21 + 21 = 0 -4m = 0 + -49m -4m = -49m Solving -4m = -49m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '49m' to each side of the equation. -4m + 49m = -49m + 49m Combine like terms: -4m + 49m = 45m 45m = -49m + 49m Combine like terms: -49m + 49m = 0 45m = 0 Divide each side by '45'. m = 0 Simplifying m = 0
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