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Simplifying 91 = 7(1 + -3M) + 7m 91 = (1 * 7 + -3M * 7) + 7m 91 = (7 + -21M) + 7m Solving 91 = 7 + -21M + 7m Solving for variable 'M'. Move all terms containing M to the left, all other terms to the right. Add '21M' to each side of the equation. 91 + 21M = 7 + -21M + 21M + 7m Combine like terms: -21M + 21M = 0 91 + 21M = 7 + 0 + 7m 91 + 21M = 7 + 7m Add '-91' to each side of the equation. 91 + -91 + 21M = 7 + -91 + 7m Combine like terms: 91 + -91 = 0 0 + 21M = 7 + -91 + 7m 21M = 7 + -91 + 7m Combine like terms: 7 + -91 = -84 21M = -84 + 7m Divide each side by '21'. M = -4 + 0.3333333333m Simplifying M = -4 + 0.3333333333m
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