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Simplifying 7 + 2(a + -6) = -9 Reorder the terms: 7 + 2(-6 + a) = -9 7 + (-6 * 2 + a * 2) = -9 7 + (-12 + 2a) = -9 Combine like terms: 7 + -12 = -5 -5 + 2a = -9 Solving -5 + 2a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 2a = -9 + 5 Combine like terms: -5 + 5 = 0 0 + 2a = -9 + 5 2a = -9 + 5 Combine like terms: -9 + 5 = -4 2a = -4 Divide each side by '2'. a = -2 Simplifying a = -2
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