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Simplifying (2a + 7) + (5 + -1a) = 0 Reorder the terms: (7 + 2a) + (5 + -1a) = 0 Remove parenthesis around (7 + 2a) 7 + 2a + (5 + -1a) = 0 Remove parenthesis around (5 + -1a) 7 + 2a + 5 + -1a = 0 Reorder the terms: 7 + 5 + 2a + -1a = 0 Combine like terms: 7 + 5 = 12 12 + 2a + -1a = 0 Combine like terms: 2a + -1a = 1a 12 + 1a = 0 Solving 12 + 1a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 1a = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 1a = 0 + -12 1a = 0 + -12 Combine like terms: 0 + -12 = -12 1a = -12 Divide each side by '1'. a = -12 Simplifying a = -12
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