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Simplifying 7 + (2a + -3) = -9 Reorder the terms: 7 + (-3 + 2a) = -9 Remove parenthesis around (-3 + 2a) 7 + -3 + 2a = -9 Combine like terms: 7 + -3 = 4 4 + 2a = -9 Solving 4 + 2a = -9 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 = -9 + -4 Combine like terms: 4 + -4 = 0 0 + 2a = -9 + -4 2a = -9 + -4 Combine like terms: -9 + -4 = -13 2a = -13 Divide each side by '2'. a = -6.5 Simplifying a = -6.5
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