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Simplifying -1(8a + 1) + -1a = 11 Reorder the terms: -1(1 + 8a) + -1a = 11 (1 * -1 + 8a * -1) + -1a = 11 (-1 + -8a) + -1a = 11 Combine like terms: -8a + -1a = -9a -1 + -9a = 11 Solving -1 + -9a = 11 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -9a = 11 + 1 Combine like terms: -1 + 1 = 0 0 + -9a = 11 + 1 -9a = 11 + 1 Combine like terms: 11 + 1 = 12 -9a = 12 Divide each side by '-9'. a = -1.333333333 Simplifying a = -1.333333333
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