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Simplifying -4 = a + 8 + -2a Reorder the terms: -4 = 8 + a + -2a Combine like terms: a + -2a = -1a -4 = 8 + -1a Solving -4 = 8 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. -4 + a = 8 + -1a + a Combine like terms: -1a + a = 0 -4 + a = 8 + 0 -4 + a = 8 Add '4' to each side of the equation. -4 + 4 + a = 8 + 4 Combine like terms: -4 + 4 = 0 0 + a = 8 + 4 a = 8 + 4 Combine like terms: 8 + 4 = 12 a = 12 Simplifying a = 12
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