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Simplifying 4(a + 3) = -20 Reorder the terms: 4(3 + a) = -20 (3 * 4 + a * 4) = -20 (12 + 4a) = -20 Solving 12 + 4a = -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 + 4a = -20 + -12 Combine like terms: 12 + -12 = 0 0 + 4a = -20 + -12 4a = -20 + -12 Combine like terms: -20 + -12 = -32 4a = -32 Divide each side by '4'. a = -8 Simplifying a = -8
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