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