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Simplifying 21 + 9 = 15b + 3 Combine like terms: 21 + 9 = 30 30 = 15b + 3 Reorder the terms: 30 = 3 + 15b Solving 30 = 3 + 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. 30 + -15b = 3 + 15b + -15b Combine like terms: 15b + -15b = 0 30 + -15b = 3 + 0 30 + -15b = 3 Add '-30' to each side of the equation. 30 + -30 + -15b = 3 + -30 Combine like terms: 30 + -30 = 0 0 + -15b = 3 + -30 -15b = 3 + -30 Combine like terms: 3 + -30 = -27 -15b = -27 Divide each side by '-15'. b = 1.8 Simplifying b = 1.8
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