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Simplifying -3(a + -1) = 21 Reorder the terms: -3(-1 + a) = 21 (-1 * -3 + a * -3) = 21 (3 + -3a) = 21 Solving 3 + -3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -3a = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -3a = 21 + -3 -3a = 21 + -3 Combine like terms: 21 + -3 = 18 -3a = 18 Divide each side by '-3'. a = -6 Simplifying a = -6
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