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Simplifying 55a + -3(9a + 12) = -64 Reorder the terms: 55a + -3(12 + 9a) = -64 55a + (12 * -3 + 9a * -3) = -64 55a + (-36 + -27a) = -64 Reorder the terms: -36 + 55a + -27a = -64 Combine like terms: 55a + -27a = 28a -36 + 28a = -64 Solving -36 + 28a = -64 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 28a = -64 + 36 Combine like terms: -36 + 36 = 0 0 + 28a = -64 + 36 28a = -64 + 36 Combine like terms: -64 + 36 = -28 28a = -28 Divide each side by '28'. a = -1 Simplifying a = -1
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