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Simplifying 12a + -15 = 129 Reorder the terms: -15 + 12a = 129 Solving -15 + 12a = 129 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 + 12a = 129 + 15 Combine like terms: -15 + 15 = 0 0 + 12a = 129 + 15 12a = 129 + 15 Combine like terms: 129 + 15 = 144 12a = 144 Divide each side by '12'. a = 12 Simplifying a = 12
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