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Simplifying 38a + 21 + -20a = 39 Reorder the terms: 21 + 38a + -20a = 39 Combine like terms: 38a + -20a = 18a 21 + 18a = 39 Solving 21 + 18a = 39 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 + 18a = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 18a = 39 + -21 18a = 39 + -21 Combine like terms: 39 + -21 = 18 18a = 18 Divide each side by '18'. a = 1 Simplifying a = 1
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