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Simplifying 72 = 20 + -8a Solving 72 = 20 + -8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8a' to each side of the equation. 72 + 8a = 20 + -8a + 8a Combine like terms: -8a + 8a = 0 72 + 8a = 20 + 0 72 + 8a = 20 Add '-72' to each side of the equation. 72 + -72 + 8a = 20 + -72 Combine like terms: 72 + -72 = 0 0 + 8a = 20 + -72 8a = 20 + -72 Combine like terms: 20 + -72 = -52 8a = -52 Divide each side by '8'. a = -6.5 Simplifying a = -6.5
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