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