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Simplifying 7 + -1(2a + -9) + 2 = 0 Reorder the terms: 7 + -1(-9 + 2a) + 2 = 0 7 + (-9 * -1 + 2a * -1) + 2 = 0 7 + (9 + -2a) + 2 = 0 Reorder the terms: 7 + 9 + 2 + -2a = 0 Combine like terms: 7 + 9 = 16 16 + 2 + -2a = 0 Combine like terms: 16 + 2 = 18 18 + -2a = 0 Solving 18 + -2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -2a = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -2a = 0 + -18 -2a = 0 + -18 Combine like terms: 0 + -18 = -18 -2a = -18 Divide each side by '-2'. a = 9 Simplifying a = 9
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