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Simplifying (12 + 7.2b) + -3(0.9b + -4) = 0 Remove parenthesis around (12 + 7.2b) 12 + 7.2b + -3(0.9b + -4) = 0 Reorder the terms: 12 + 7.2b + -3(-4 + 0.9b) = 0 12 + 7.2b + (-4 * -3 + 0.9b * -3) = 0 12 + 7.2b + (12 + -2.7b) = 0 Reorder the terms: 12 + 12 + 7.2b + -2.7b = 0 Combine like terms: 12 + 12 = 24 24 + 7.2b + -2.7b = 0 Combine like terms: 7.2b + -2.7b = 4.5b 24 + 4.5b = 0 Solving 24 + 4.5b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 4.5b = 0 + -24 Combine like terms: 24 + -24 = 0 0 + 4.5b = 0 + -24 4.5b = 0 + -24 Combine like terms: 0 + -24 = -24 4.5b = -24 Divide each side by '4.5'. b = -5.333333333 Simplifying b = -5.333333333
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