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Simplifying 12 + -2(a + -4) = 13 Reorder the terms: 12 + -2(-4 + a) = 13 12 + (-4 * -2 + a * -2) = 13 12 + (8 + -2a) = 13 Combine like terms: 12 + 8 = 20 20 + -2a = 13 Solving 20 + -2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -2a = 13 + -20 Combine like terms: 20 + -20 = 0 0 + -2a = 13 + -20 -2a = 13 + -20 Combine like terms: 13 + -20 = -7 -2a = -7 Divide each side by '-2'. a = 3.5 Simplifying a = 3.5
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