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Simplifying -5 + -2(a + -4) = 13 Reorder the terms: -5 + -2(-4 + a) = 13 -5 + (-4 * -2 + a * -2) = 13 -5 + (8 + -2a) = 13 Combine like terms: -5 + 8 = 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 = 10 -2a = 10 Divide each side by '-2'. a = -5 Simplifying a = -5
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