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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 = 39 3a = 39 Divide each side by '3'. a = 13 Simplifying a = 13
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