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Simplifying 7m + mn + 21 + 3n = 0 Reorder the terms: 21 + 7m + mn + 3n = 0 Solving 21 + 7m + mn + 3n = 0 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 7m + mn + -21 + 3n = 0 + -21 Reorder the terms: 21 + -21 + 7m + mn + 3n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7m + mn + 3n = 0 + -21 7m + mn + 3n = 0 + -21 Combine like terms: 0 + -21 = -21 7m + mn + 3n = -21 Add '-3n' to each side of the equation. 7m + mn + 3n + -3n = -21 + -3n Combine like terms: 3n + -3n = 0 7m + mn + 0 = -21 + -3n 7m + mn = -21 + -3n Reorder the terms: 21 + 7m + mn + 3n = -21 + -3n + 21 + 3n Reorder the terms: 21 + 7m + mn + 3n = -21 + 21 + -3n + 3n Combine like terms: -21 + 21 = 0 21 + 7m + mn + 3n = 0 + -3n + 3n 21 + 7m + mn + 3n = -3n + 3n Combine like terms: -3n + 3n = 0 21 + 7m + mn + 3n = 0 The solution to this equation could not be determined.
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