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Simplifying 7 + 2(a + -3) = -9 Reorder the terms: 7 + 2(-3 + a) = -9 7 + (-3 * 2 + a * 2) = -9 7 + (-6 + 2a) = -9 Combine like terms: 7 + -6 = 1 1 + 2a = -9 Solving 1 + 2a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2a = -9 + -1 Combine like terms: 1 + -1 = 0 0 + 2a = -9 + -1 2a = -9 + -1 Combine like terms: -9 + -1 = -10 2a = -10 Divide each side by '2'. a = -5 Simplifying a = -5
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