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Simplifying (4a + -1a) + (2a + 30) = 180 Combine like terms: 4a + -1a = 3a (3a) + (2a + 30) = 180 (3a) + (2a + 30) = 180 Reorder the terms: (3a) + (30 + 2a) = 180 Remove parenthesis around (30 + 2a) (3a) + 30 + 2a = 180 Reorder the terms: 30 + (3a) + 2a = 180 Combine like terms: (3a) + 2a = 5a 30 + 5a = 180 Solving 30 + 5a = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 5a = 180 + -30 Combine like terms: 30 + -30 = 0 0 + 5a = 180 + -30 5a = 180 + -30 Combine like terms: 180 + -30 = 150 5a = 150 Divide each side by '5'. a = 30 Simplifying a = 30
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