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Simplifying 2(a + -9) + 15 = 13 Reorder the terms: 2(-9 + a) + 15 = 13 (-9 * 2 + a * 2) + 15 = 13 (-18 + 2a) + 15 = 13 Reorder the terms: -18 + 15 + 2a = 13 Combine like terms: -18 + 15 = -3 -3 + 2a = 13 Solving -3 + 2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2a = 13 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = 13 + 3 2a = 13 + 3 Combine like terms: 13 + 3 = 16 2a = 16 Divide each side by '2'. a = 8 Simplifying a = 8
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