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Simplifying 39a + 4 + -20a = 42 Reorder the terms: 4 + 39a + -20a = 42 Combine like terms: 39a + -20a = 19a 4 + 19a = 42 Solving 4 + 19a = 42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 19a = 42 + -4 Combine like terms: 4 + -4 = 0 0 + 19a = 42 + -4 19a = 42 + -4 Combine like terms: 42 + -4 = 38 19a = 38 Divide each side by '19'. a = 2 Simplifying a = 2
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