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Simplifying 3a + 7 + 2a = 18 + -9 Reorder the terms: 7 + 3a + 2a = 18 + -9 Combine like terms: 3a + 2a = 5a 7 + 5a = 18 + -9 Combine like terms: 18 + -9 = 9 7 + 5a = 9 Solving 7 + 5a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5a = 9 + -7 Combine like terms: 7 + -7 = 0 0 + 5a = 9 + -7 5a = 9 + -7 Combine like terms: 9 + -7 = 2 5a = 2 Divide each side by '5'. a = 0.4 Simplifying a = 0.4
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