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Simplifying a + (a + -2) = 40 Reorder the terms: a + (-2 + a) = 40 Remove parenthesis around (-2 + a) a + -2 + a = 40 Reorder the terms: -2 + a + a = 40 Combine like terms: a + a = 2a -2 + 2a = 40 Solving -2 + 2a = 40 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 2a = 40 + 2 Combine like terms: -2 + 2 = 0 0 + 2a = 40 + 2 2a = 40 + 2 Combine like terms: 40 + 2 = 42 2a = 42 Divide each side by '2'. a = 21 Simplifying a = 21
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