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Simplifying 7b + -9 = 4b + 21 Reorder the terms: -9 + 7b = 4b + 21 Reorder the terms: -9 + 7b = 21 + 4b Solving -9 + 7b = 21 + 4b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4b' to each side of the equation. -9 + 7b + -4b = 21 + 4b + -4b Combine like terms: 7b + -4b = 3b -9 + 3b = 21 + 4b + -4b Combine like terms: 4b + -4b = 0 -9 + 3b = 21 + 0 -9 + 3b = 21 Add '9' to each side of the equation. -9 + 9 + 3b = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 3b = 21 + 9 3b = 21 + 9 Combine like terms: 21 + 9 = 30 3b = 30 Divide each side by '3'. b = 10 Simplifying b = 10
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