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Simplifying 10b + 40(0.90b) + 30(0.80b) = 525 Remove parenthesis around (0.90b) 10b + 40 * 0.90b + 30(0.80b) = 525 Multiply 40 * 0.90 10b + 36b + 30(0.80b) = 525 Remove parenthesis around (0.80b) 10b + 36b + 30 * 0.80b = 525 Multiply 30 * 0.80 10b + 36b + 24b = 525 Combine like terms: 10b + 36b = 46b 46b + 24b = 525 Combine like terms: 46b + 24b = 70b 70b = 525 Solving 70b = 525 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Divide each side by '70'. b = 7.5 Simplifying b = 7.5
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