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Simplifying (a + -2) * 3 = 21 Reorder the terms: (-2 + a) * 3 = 21 Reorder the terms for easier multiplication: 3(-2 + a) = 21 (-2 * 3 + a * 3) = 21 (-6 + 3a) = 21 Solving -6 + 3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3a = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 3a = 21 + 6 3a = 21 + 6 Combine like terms: 21 + 6 = 27 3a = 27 Divide each side by '3'. a = 9 Simplifying a = 9
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