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Simplifying 4 + 4(2 + -2a) = -28 4 + (2 * 4 + -2a * 4) = -28 4 + (8 + -8a) = -28 Combine like terms: 4 + 8 = 12 12 + -8a = -28 Solving 12 + -8a = -28 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 + -8a = -28 + -12 Combine like terms: 12 + -12 = 0 0 + -8a = -28 + -12 -8a = -28 + -12 Combine like terms: -28 + -12 = -40 -8a = -40 Divide each side by '-8'. a = 5 Simplifying a = 5
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