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Simplifying a + (a + -15) = 55 Reorder the terms: a + (-15 + a) = 55 Remove parenthesis around (-15 + a) a + -15 + a = 55 Reorder the terms: -15 + a + a = 55 Combine like terms: a + a = 2a -15 + 2a = 55 Solving -15 + 2a = 55 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 2a = 55 + 15 Combine like terms: -15 + 15 = 0 0 + 2a = 55 + 15 2a = 55 + 15 Combine like terms: 55 + 15 = 70 2a = 70 Divide each side by '2'. a = 35 Simplifying a = 35
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