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Simplifying 8 + 9a = 20 + -3a Solving 8 + 9a = 20 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 8 + 9a + 3a = 20 + -3a + 3a Combine like terms: 9a + 3a = 12a 8 + 12a = 20 + -3a + 3a Combine like terms: -3a + 3a = 0 8 + 12a = 20 + 0 8 + 12a = 20 Add '-8' to each side of the equation. 8 + -8 + 12a = 20 + -8 Combine like terms: 8 + -8 = 0 0 + 12a = 20 + -8 12a = 20 + -8 Combine like terms: 20 + -8 = 12 12a = 12 Divide each side by '12'. a = 1 Simplifying a = 1
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