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Simplifying 7a = 2(2a + -9) + -6a Reorder the terms: 7a = 2(-9 + 2a) + -6a 7a = (-9 * 2 + 2a * 2) + -6a 7a = (-18 + 4a) + -6a Combine like terms: 4a + -6a = -2a 7a = -18 + -2a Solving 7a = -18 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 7a + 2a = -18 + -2a + 2a Combine like terms: 7a + 2a = 9a 9a = -18 + -2a + 2a Combine like terms: -2a + 2a = 0 9a = -18 + 0 9a = -18 Divide each side by '9'. a = -2 Simplifying a = -2
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