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Simplifying 20b + -5b + 20 = 80 Reorder the terms: 20 + 20b + -5b = 80 Combine like terms: 20b + -5b = 15b 20 + 15b = 80 Solving 20 + 15b = 80 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 15b = 80 + -20 Combine like terms: 20 + -20 = 0 0 + 15b = 80 + -20 15b = 80 + -20 Combine like terms: 80 + -20 = 60 15b = 60 Divide each side by '15'. b = 4 Simplifying b = 4
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