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Simplifying 12a + -3a + -5 = 13 Reorder the terms: -5 + 12a + -3a = 13 Combine like terms: 12a + -3a = 9a -5 + 9a = 13 Solving -5 + 9a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 9a = 13 + 5 Combine like terms: -5 + 5 = 0 0 + 9a = 13 + 5 9a = 13 + 5 Combine like terms: 13 + 5 = 18 9a = 18 Divide each side by '9'. a = 2 Simplifying a = 2
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