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Simplifying a + (4 + a) = 18 Remove parenthesis around (4 + a) a + 4 + a = 18 Reorder the terms: 4 + a + a = 18 Combine like terms: a + a = 2a 4 + 2a = 18 Solving 4 + 2a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2a = 18 + -4 Combine like terms: 4 + -4 = 0 0 + 2a = 18 + -4 2a = 18 + -4 Combine like terms: 18 + -4 = 14 2a = 14 Divide each side by '2'. a = 7 Simplifying a = 7
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