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Simplifying 7m + mn + 21 + 3b = 0 Reorder the terms: 21 + 3b + 7m + mn = 0 Solving 21 + 3b + 7m + mn = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 3b + 7m + -21 + mn = 0 + -21 Reorder the terms: 21 + -21 + 3b + 7m + mn = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3b + 7m + mn = 0 + -21 3b + 7m + mn = 0 + -21 Combine like terms: 0 + -21 = -21 3b + 7m + mn = -21 Add '-7m' to each side of the equation. 3b + 7m + -7m + mn = -21 + -7m Combine like terms: 7m + -7m = 0 3b + 0 + mn = -21 + -7m 3b + mn = -21 + -7m Add '-1mn' to each side of the equation. 3b + mn + -1mn = -21 + -7m + -1mn Combine like terms: mn + -1mn = 0 3b + 0 = -21 + -7m + -1mn 3b = -21 + -7m + -1mn Divide each side by '3'. b = -7 + -2.333333333m + -0.3333333333mn Simplifying b = -7 + -2.333333333m + -0.3333333333mn
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