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Simplifying 8(a + 7) = -72 Reorder the terms: 8(7 + a) = -72 (7 * 8 + a * 8) = -72 (56 + 8a) = -72 Solving 56 + 8a = -72 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + 8a = -72 + -56 Combine like terms: 56 + -56 = 0 0 + 8a = -72 + -56 8a = -72 + -56 Combine like terms: -72 + -56 = -128 8a = -128 Divide each side by '8'. a = -16 Simplifying a = -16
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