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Simplifying 9a + 2 + 10a = 21 Reorder the terms: 2 + 9a + 10a = 21 Combine like terms: 9a + 10a = 19a 2 + 19a = 21 Solving 2 + 19a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 19a = 21 + -2 Combine like terms: 2 + -2 = 0 0 + 19a = 21 + -2 19a = 21 + -2 Combine like terms: 21 + -2 = 19 19a = 19 Divide each side by '19'. a = 1 Simplifying a = 1
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