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Simplifying a + 2(a + -4) = 13 Reorder the terms: a + 2(-4 + a) = 13 a + (-4 * 2 + a * 2) = 13 a + (-8 + 2a) = 13 Reorder the terms: -8 + a + 2a = 13 Combine like terms: a + 2a = 3a -8 + 3a = 13 Solving -8 + 3a = 13 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 + 3a = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 3a = 13 + 8 3a = 13 + 8 Combine like terms: 13 + 8 = 21 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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