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Simplifying -1(-1a + -7) = 12 Reorder the terms: -1(-7 + -1a) = 12 (-7 * -1 + -1a * -1) = 12 (7 + 1a) = 12 Solving 7 + 1a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1a = 12 + -7 Combine like terms: 7 + -7 = 0 0 + 1a = 12 + -7 1a = 12 + -7 Combine like terms: 12 + -7 = 5 1a = 5 Divide each side by '1'. a = 5 Simplifying a = 5
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