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Simplifying 7a + 2(a + -4) = 13 Reorder the terms: 7a + 2(-4 + a) = 13 7a + (-4 * 2 + a * 2) = 13 7a + (-8 + 2a) = 13 Reorder the terms: -8 + 7a + 2a = 13 Combine like terms: 7a + 2a = 9a -8 + 9a = 13 Solving -8 + 9a = 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 + 9a = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 9a = 13 + 8 9a = 13 + 8 Combine like terms: 13 + 8 = 21 9a = 21 Divide each side by '9'. a = 2.333333333 Simplifying a = 2.333333333
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