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Simplifying (a + 40) + a = 180 Reorder the terms: (40 + a) + a = 180 Remove parenthesis around (40 + a) 40 + a + a = 180 Combine like terms: a + a = 2a 40 + 2a = 180 Solving 40 + 2a = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 2a = 180 + -40 Combine like terms: 40 + -40 = 0 0 + 2a = 180 + -40 2a = 180 + -40 Combine like terms: 180 + -40 = 140 2a = 140 Divide each side by '2'. a = 70 Simplifying a = 70
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