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Simplifying 12a + -3(2a + -5) = 45 Reorder the terms: 12a + -3(-5 + 2a) = 45 12a + (-5 * -3 + 2a * -3) = 45 12a + (15 + -6a) = 45 Reorder the terms: 15 + 12a + -6a = 45 Combine like terms: 12a + -6a = 6a 15 + 6a = 45 Solving 15 + 6a = 45 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 6a = 45 + -15 Combine like terms: 15 + -15 = 0 0 + 6a = 45 + -15 6a = 45 + -15 Combine like terms: 45 + -15 = 30 6a = 30 Divide each side by '6'. a = 5 Simplifying a = 5
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