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Simplifying 9 = -5a + -4a Combine like terms: -5a + -4a = -9a 9 = -9a Solving 9 = -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. 9 + 9a = -9a + 9a Combine like terms: -9a + 9a = 0 9 + 9a = 0 Add '-9' to each side of the equation. 9 + -9 + 9a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 9a = 0 + -9 9a = 0 + -9 Combine like terms: 0 + -9 = -9 9a = -9 Divide each side by '9'. a = -1 Simplifying a = -1
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