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Simplifying a + -4 + -4 = 12 Reorder the terms: -4 + -4 + a = 12 Combine like terms: -4 + -4 = -8 -8 + a = 12 Solving -8 + a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = 12 + 8 Combine like terms: -8 + 8 = 0 0 + a = 12 + 8 a = 12 + 8 Combine like terms: 12 + 8 = 20 a = 20 Simplifying a = 20
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