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Simplifying 12 + -3(a + -3) = -21 Reorder the terms: 12 + -3(-3 + a) = -21 12 + (-3 * -3 + a * -3) = -21 12 + (9 + -3a) = -21 Combine like terms: 12 + 9 = 21 21 + -3a = -21 Solving 21 + -3a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3a = -21 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = -21 + -21 -3a = -21 + -21 Combine like terms: -21 + -21 = -42 -3a = -42 Divide each side by '-3'. a = 14 Simplifying a = 14
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