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Simplifying -2a + 9 + -7 + 8a = -18 Reorder the terms: 9 + -7 + -2a + 8a = -18 Combine like terms: 9 + -7 = 2 2 + -2a + 8a = -18 Combine like terms: -2a + 8a = 6a 2 + 6a = -18 Solving 2 + 6a = -18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 6a = -18 + -2 Combine like terms: 2 + -2 = 0 0 + 6a = -18 + -2 6a = -18 + -2 Combine like terms: -18 + -2 = -20 6a = -20 Divide each side by '6'. a = -3.333333333 Simplifying a = -3.333333333
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