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Simplifying 5a + 9 = 21 Reorder the terms: 9 + 5a = 21 Solving 9 + 5a = 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 + 5a = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 5a = 21 + -9 5a = 21 + -9 Combine like terms: 21 + -9 = 12 5a = 12 Divide each side by '5'. a = 2.4 Simplifying a = 2.4
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