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