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Simplifying 21 + 24b = 42 + 17b Solving 21 + 24b = 42 + 17b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-17b' to each side of the equation. 21 + 24b + -17b = 42 + 17b + -17b Combine like terms: 24b + -17b = 7b 21 + 7b = 42 + 17b + -17b Combine like terms: 17b + -17b = 0 21 + 7b = 42 + 0 21 + 7b = 42 Add '-21' to each side of the equation. 21 + -21 + 7b = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 7b = 42 + -21 7b = 42 + -21 Combine like terms: 42 + -21 = 21 7b = 21 Divide each side by '7'. b = 3 Simplifying b = 3
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