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Simplifying 4 + 2(a + 4) = -20 Reorder the terms: 4 + 2(4 + a) = -20 4 + (4 * 2 + a * 2) = -20 4 + (8 + 2a) = -20 Combine like terms: 4 + 8 = 12 12 + 2a = -20 Solving 12 + 2a = -20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2a = -20 + -12 Combine like terms: 12 + -12 = 0 0 + 2a = -20 + -12 2a = -20 + -12 Combine like terms: -20 + -12 = -32 2a = -32 Divide each side by '2'. a = -16 Simplifying a = -16
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