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Simplifying 2 + 7a + 7 = 20 + 2a Reorder the terms: 2 + 7 + 7a = 20 + 2a Combine like terms: 2 + 7 = 9 9 + 7a = 20 + 2a Solving 9 + 7a = 20 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 9 + 7a + -2a = 20 + 2a + -2a Combine like terms: 7a + -2a = 5a 9 + 5a = 20 + 2a + -2a Combine like terms: 2a + -2a = 0 9 + 5a = 20 + 0 9 + 5a = 20 Add '-9' to each side of the equation. 9 + -9 + 5a = 20 + -9 Combine like terms: 9 + -9 = 0 0 + 5a = 20 + -9 5a = 20 + -9 Combine like terms: 20 + -9 = 11 5a = 11 Divide each side by '5'. a = 2.2 Simplifying a = 2.2
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