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Simplifying a + (a + -20) = 80 Reorder the terms: a + (-20 + a) = 80 Remove parenthesis around (-20 + a) a + -20 + a = 80 Reorder the terms: -20 + a + a = 80 Combine like terms: a + a = 2a -20 + 2a = 80 Solving -20 + 2a = 80 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 + 2a = 80 + 20 Combine like terms: -20 + 20 = 0 0 + 2a = 80 + 20 2a = 80 + 20 Combine like terms: 80 + 20 = 100 2a = 100 Divide each side by '2'. a = 50 Simplifying a = 50
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