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Simplifying 8.9 + 1.2(3a + -1) = 149 Reorder the terms: 8.9 + 1.2(-1 + 3a) = 149 8.9 + (-1 * 1.2 + 3a * 1.2) = 149 8.9 + (-1.2 + 3.6a) = 149 Combine like terms: 8.9 + -1.2 = 7.7 7.7 + 3.6a = 149 Solving 7.7 + 3.6a = 149 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7.7' to each side of the equation. 7.7 + -7.7 + 3.6a = 149 + -7.7 Combine like terms: 7.7 + -7.7 = 0.0 0.0 + 3.6a = 149 + -7.7 3.6a = 149 + -7.7 Combine like terms: 149 + -7.7 = 141.3 3.6a = 141.3 Divide each side by '3.6'. a = 39.25 Simplifying a = 39.25
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