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Simplifying 3b + -19 = b + 21 Reorder the terms: -19 + 3b = b + 21 Reorder the terms: -19 + 3b = 21 + b Solving -19 + 3b = 21 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. -19 + 3b + -1b = 21 + b + -1b Combine like terms: 3b + -1b = 2b -19 + 2b = 21 + b + -1b Combine like terms: b + -1b = 0 -19 + 2b = 21 + 0 -19 + 2b = 21 Add '19' to each side of the equation. -19 + 19 + 2b = 21 + 19 Combine like terms: -19 + 19 = 0 0 + 2b = 21 + 19 2b = 21 + 19 Combine like terms: 21 + 19 = 40 2b = 40 Divide each side by '2'. b = 20 Simplifying b = 20
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