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Simplifying 20 = 9a + 8 + -15a Reorder the terms: 20 = 8 + 9a + -15a Combine like terms: 9a + -15a = -6a 20 = 8 + -6a Solving 20 = 8 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. 20 + 6a = 8 + -6a + 6a Combine like terms: -6a + 6a = 0 20 + 6a = 8 + 0 20 + 6a = 8 Add '-20' to each side of the equation. 20 + -20 + 6a = 8 + -20 Combine like terms: 20 + -20 = 0 0 + 6a = 8 + -20 6a = 8 + -20 Combine like terms: 8 + -20 = -12 6a = -12 Divide each side by '6'. a = -2 Simplifying a = -2
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