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Simplifying 20c + 25b + 30 = 690 Reorder the terms: 30 + 25b + 20c = 690 Solving 30 + 25b + 20c = 690 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + 25b + -30 + 20c = 690 + -30 Reorder the terms: 30 + -30 + 25b + 20c = 690 + -30 Combine like terms: 30 + -30 = 0 0 + 25b + 20c = 690 + -30 25b + 20c = 690 + -30 Combine like terms: 690 + -30 = 660 25b + 20c = 660 Add '-20c' to each side of the equation. 25b + 20c + -20c = 660 + -20c Combine like terms: 20c + -20c = 0 25b + 0 = 660 + -20c 25b = 660 + -20c Divide each side by '25'. b = 26.4 + -0.8c Simplifying b = 26.4 + -0.8c
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