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Simplifying 7(4a + -4) = 112 Reorder the terms: 7(-4 + 4a) = 112 (-4 * 7 + 4a * 7) = 112 (-28 + 28a) = 112 Solving -28 + 28a = 112 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 28a = 112 + 28 Combine like terms: -28 + 28 = 0 0 + 28a = 112 + 28 28a = 112 + 28 Combine like terms: 112 + 28 = 140 28a = 140 Divide each side by '28'. a = 5 Simplifying a = 5
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