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Simplifying -21 = -7M Solving -21 = -7M Solving for variable 'M'. Move all terms containing M to the left, all other terms to the right. Add '7M' to each side of the equation. -21 + 7M = -7M + 7M Combine like terms: -7M + 7M = 0 -21 + 7M = 0 Add '21' to each side of the equation. -21 + 21 + 7M = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7M = 0 + 21 7M = 0 + 21 Combine like terms: 0 + 21 = 21 7M = 21 Divide each side by '7'. M = 3 Simplifying M = 3
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