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Simplifying 180 = a + (2a + -15) Reorder the terms: 180 = a + (-15 + 2a) Remove parenthesis around (-15 + 2a) 180 = a + -15 + 2a Reorder the terms: 180 = -15 + a + 2a Combine like terms: a + 2a = 3a 180 = -15 + 3a Solving 180 = -15 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 180 + -3a = -15 + 3a + -3a Combine like terms: 3a + -3a = 0 180 + -3a = -15 + 0 180 + -3a = -15 Add '-180' to each side of the equation. 180 + -180 + -3a = -15 + -180 Combine like terms: 180 + -180 = 0 0 + -3a = -15 + -180 -3a = -15 + -180 Combine like terms: -15 + -180 = -195 -3a = -195 Divide each side by '-3'. a = 65 Simplifying a = 65
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