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Simplifying (0.5a) + (20 + a) + (a) = 180 Remove parenthesis around (20 + a) (0.5a) + 20 + a + (a) = 180 (0.5a) + 20 + a + a = 180 Reorder the terms: 20 + (0.5a) + a + a = 180 Combine like terms: (0.5a) + a = 1.5a 20 + 1.5a + a = 180 Combine like terms: 1.5a + a = 2.5a 20 + 2.5a = 180 Solving 20 + 2.5a = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2.5a = 180 + -20 Combine like terms: 20 + -20 = 0 0 + 2.5a = 180 + -20 2.5a = 180 + -20 Combine like terms: 180 + -20 = 160 2.5a = 160 Divide each side by '2.5'. a = 64 Simplifying a = 64
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