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Simplifying -21 + (10a + -1a) = 0 Combine like terms: 10a + -1a = 9a -21 + (9a) = 0 -21 + (9a) = 0 Solving -21 + (9a) = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + (9a) = 0 + 21 Combine like terms: -21 + 21 = 0 0 + (9a) = 0 + 21 (9a) = 0 + 21 Combine like terms: 0 + 21 = 21 (9a) = 21 Divide each side by '9'. a = 2.333333333 Simplifying a = 2.333333333
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