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Simplifying 2(a + -9) = 8 Reorder the terms: 2(-9 + a) = 8 (-9 * 2 + a * 2) = 8 (-18 + 2a) = 8 Solving -18 + 2a = 8 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 2a = 8 + 18 Combine like terms: -18 + 18 = 0 0 + 2a = 8 + 18 2a = 8 + 18 Combine like terms: 8 + 18 = 26 2a = 26 Divide each side by '2'. a = 13 Simplifying a = 13
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