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Simplifying 2a + 3(a + -1) = 12 Reorder the terms: 2a + 3(-1 + a) = 12 2a + (-1 * 3 + a * 3) = 12 2a + (-3 + 3a) = 12 Reorder the terms: -3 + 2a + 3a = 12 Combine like terms: 2a + 3a = 5a -3 + 5a = 12 Solving -3 + 5a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 5a = 12 + 3 Combine like terms: -3 + 3 = 0 0 + 5a = 12 + 3 5a = 12 + 3 Combine like terms: 12 + 3 = 15 5a = 15 Divide each side by '5'. a = 3 Simplifying a = 3
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