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Simplifying 7a + 3a + 2 + -1a = 20 Reorder the terms: 2 + 7a + 3a + -1a = 20 Combine like terms: 7a + 3a = 10a 2 + 10a + -1a = 20 Combine like terms: 10a + -1a = 9a 2 + 9a = 20 Solving 2 + 9a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 9a = 20 + -2 Combine like terms: 2 + -2 = 0 0 + 9a = 20 + -2 9a = 20 + -2 Combine like terms: 20 + -2 = 18 9a = 18 Divide each side by '9'. a = 2 Simplifying a = 2
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