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