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Simplifying (2a + -20) = -19 Reorder the terms: (-20 + 2a) = -19 Remove parenthesis around (-20 + 2a) -20 + 2a = -19 Solving -20 + 2a = -19 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 = -19 + 20 Combine like terms: -20 + 20 = 0 0 + 2a = -19 + 20 2a = -19 + 20 Combine like terms: -19 + 20 = 1 2a = 1 Divide each side by '2'. a = 0.5 Simplifying a = 0.5
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