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Simplifying 15(10 + b) + 20(7) = 425 (10 * 15 + b * 15) + 20(7) = 425 (150 + 15b) + 20(7) = 425 Multiply 20 * 7 150 + 15b + 140 = 425 Reorder the terms: 150 + 140 + 15b = 425 Combine like terms: 150 + 140 = 290 290 + 15b = 425 Solving 290 + 15b = 425 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-290' to each side of the equation. 290 + -290 + 15b = 425 + -290 Combine like terms: 290 + -290 = 0 0 + 15b = 425 + -290 15b = 425 + -290 Combine like terms: 425 + -290 = 135 15b = 135 Divide each side by '15'. b = 9 Simplifying b = 9
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