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Simplifying 8.9 + 1.2[3a + -1] = 14.9 Reorder the terms: 8.9 + 1.2[-1 + 3a] = 14.9 8.9 + [-1 * 1.2 + 3a * 1.2] = 14.9 8.9 + [-1.2 + 3.6a] = 14.9 Combine like terms: 8.9 + -1.2 = 7.7 7.7 + 3.6a = 14.9 Solving 7.7 + 3.6a = 14.9 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 = 14.9 + -7.7 Combine like terms: 7.7 + -7.7 = 0.0 0.0 + 3.6a = 14.9 + -7.7 3.6a = 14.9 + -7.7 Combine like terms: 14.9 + -7.7 = 7.2 3.6a = 7.2 Divide each side by '3.6'. a = 2 Simplifying a = 2
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