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Simplifying -5a + 20 + 8a = 7a + -9a Reorder the terms: 20 + -5a + 8a = 7a + -9a Combine like terms: -5a + 8a = 3a 20 + 3a = 7a + -9a Combine like terms: 7a + -9a = -2a 20 + 3a = -2a Solving 20 + 3a = -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 20 + 3a + 2a = -2a + 2a Combine like terms: 3a + 2a = 5a 20 + 5a = -2a + 2a Combine like terms: -2a + 2a = 0 20 + 5a = 0 Add '-20' to each side of the equation. 20 + -20 + 5a = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 5a = 0 + -20 5a = 0 + -20 Combine like terms: 0 + -20 = -20 5a = -20 Divide each side by '5'. a = -4 Simplifying a = -4
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