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Simplifying a + 54 = 180 + -2a Reorder the terms: 54 + a = 180 + -2a Solving 54 + a = 180 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 54 + a + 2a = 180 + -2a + 2a Combine like terms: a + 2a = 3a 54 + 3a = 180 + -2a + 2a Combine like terms: -2a + 2a = 0 54 + 3a = 180 + 0 54 + 3a = 180 Add '-54' to each side of the equation. 54 + -54 + 3a = 180 + -54 Combine like terms: 54 + -54 = 0 0 + 3a = 180 + -54 3a = 180 + -54 Combine like terms: 180 + -54 = 126 3a = 126 Divide each side by '3'. a = 42 Simplifying a = 42
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