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Simplifying (7a + 1) + 2 = 18 Reorder the terms: (1 + 7a) + 2 = 18 Remove parenthesis around (1 + 7a) 1 + 7a + 2 = 18 Reorder the terms: 1 + 2 + 7a = 18 Combine like terms: 1 + 2 = 3 3 + 7a = 18 Solving 3 + 7a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 7a = 18 + -3 Combine like terms: 3 + -3 = 0 0 + 7a = 18 + -3 7a = 18 + -3 Combine like terms: 18 + -3 = 15 7a = 15 Divide each side by '7'. a = 2.142857143 Simplifying a = 2.142857143
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