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Simplifying x + 2x + a = 180 Reorder the terms: a + x + 2x = 180 Combine like terms: x + 2x = 3x a + 3x = 180 Solving a + 3x = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3x' to each side of the equation. a + 3x + -3x = 180 + -3x Combine like terms: 3x + -3x = 0 a + 0 = 180 + -3x a = 180 + -3x Simplifying a = 180 + -3x
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