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Simplifying 3 + 7a + 7 = 20 + 2a Reorder the terms: 3 + 7 + 7a = 20 + 2a Combine like terms: 3 + 7 = 10 10 + 7a = 20 + 2a Solving 10 + 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. 10 + 7a + -2a = 20 + 2a + -2a Combine like terms: 7a + -2a = 5a 10 + 5a = 20 + 2a + -2a Combine like terms: 2a + -2a = 0 10 + 5a = 20 + 0 10 + 5a = 20 Add '-10' to each side of the equation. 10 + -10 + 5a = 20 + -10 Combine like terms: 10 + -10 = 0 0 + 5a = 20 + -10 5a = 20 + -10 Combine like terms: 20 + -10 = 10 5a = 10 Divide each side by '5'. a = 2 Simplifying a = 2
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