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Simplifying (-2a + -9) + (9 + 4) = 0 Reorder the terms: (-9 + -2a) + (9 + 4) = 0 Remove parenthesis around (-9 + -2a) -9 + -2a + (9 + 4) = 0 Combine like terms: 9 + 4 = 13 -9 + -2a + (13) = 0 -9 + -2a + 13 = 0 Reorder the terms: -9 + 13 + -2a = 0 Combine like terms: -9 + 13 = 4 4 + -2a = 0 Solving 4 + -2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -2a = 0 + -4 -2a = 0 + -4 Combine like terms: 0 + -4 = -4 -2a = -4 Divide each side by '-2'. a = 2 Simplifying a = 2
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