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Simplifying 9a = 90 + -1a Solving 9a = 90 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 9a + a = 90 + -1a + a Combine like terms: 9a + a = 10a 10a = 90 + -1a + a Combine like terms: -1a + a = 0 10a = 90 + 0 10a = 90 Divide each side by '10'. a = 9 Simplifying a = 9
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