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