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Simplifying -1(a + -7) + 11 = 9 Reorder the terms: -1(-7 + a) + 11 = 9 (-7 * -1 + a * -1) + 11 = 9 (7 + -1a) + 11 = 9 Reorder the terms: 7 + 11 + -1a = 9 Combine like terms: 7 + 11 = 18 18 + -1a = 9 Solving 18 + -1a = 9 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 + -1a = 9 + -18 Combine like terms: 18 + -18 = 0 0 + -1a = 9 + -18 -1a = 9 + -18 Combine like terms: 9 + -18 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9
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