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Simplifying 3 + 7a + 7 = 20 Reorder the terms: 3 + 7 + 7a = 20 Combine like terms: 3 + 7 = 10 10 + 7a = 20 Solving 10 + 7a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 7a = 20 + -10 Combine like terms: 10 + -10 = 0 0 + 7a = 20 + -10 7a = 20 + -10 Combine like terms: 20 + -10 = 10 7a = 10 Divide each side by '7'. a = 1.428571429 Simplifying a = 1.428571429
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