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Simplifying 20 = 12 + -8a Solving 20 = 12 + -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. 20 + 8a = 12 + -8a + 8a Combine like terms: -8a + 8a = 0 20 + 8a = 12 + 0 20 + 8a = 12 Add '-20' to each side of the equation. 20 + -20 + 8a = 12 + -20 Combine like terms: 20 + -20 = 0 0 + 8a = 12 + -20 8a = 12 + -20 Combine like terms: 12 + -20 = -8 8a = -8 Divide each side by '8'. a = -1 Simplifying a = -1
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