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Simplifying 6a + -2a + 9 = 21 Reorder the terms: 9 + 6a + -2a = 21 Combine like terms: 6a + -2a = 4a 9 + 4a = 21 Solving 9 + 4a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4a = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = 21 + -9 4a = 21 + -9 Combine like terms: 21 + -9 = 12 4a = 12 Divide each side by '4'. a = 3 Simplifying a = 3
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