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Simplifying 7a + 39 = 20a Reorder the terms: 39 + 7a = 20a Solving 39 + 7a = 20a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20a' to each side of the equation. 39 + 7a + -20a = 20a + -20a Combine like terms: 7a + -20a = -13a 39 + -13a = 20a + -20a Combine like terms: 20a + -20a = 0 39 + -13a = 0 Add '-39' to each side of the equation. 39 + -39 + -13a = 0 + -39 Combine like terms: 39 + -39 = 0 0 + -13a = 0 + -39 -13a = 0 + -39 Combine like terms: 0 + -39 = -39 -13a = -39 Divide each side by '-13'. a = 3 Simplifying a = 3
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