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Simplifying 12a + -9 + 2a + -1a = -87 Reorder the terms: -9 + 12a + 2a + -1a = -87 Combine like terms: 12a + 2a = 14a -9 + 14a + -1a = -87 Combine like terms: 14a + -1a = 13a -9 + 13a = -87 Solving -9 + 13a = -87 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 13a = -87 + 9 Combine like terms: -9 + 9 = 0 0 + 13a = -87 + 9 13a = -87 + 9 Combine like terms: -87 + 9 = -78 13a = -78 Divide each side by '13'. a = -6 Simplifying a = -6
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