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Simplifying -7(a + 12) = -28 Reorder the terms: -7(12 + a) = -28 (12 * -7 + a * -7) = -28 (-84 + -7a) = -28 Solving -84 + -7a = -28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + -7a = -28 + 84 Combine like terms: -84 + 84 = 0 0 + -7a = -28 + 84 -7a = -28 + 84 Combine like terms: -28 + 84 = 56 -7a = 56 Divide each side by '-7'. a = -8 Simplifying a = -8
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