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Simplifying 21 + -3(2 + -1a) = -12 21 + (2 * -3 + -1a * -3) = -12 21 + (-6 + 3a) = -12 Combine like terms: 21 + -6 = 15 15 + 3a = -12 Solving 15 + 3a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3a = -12 + -15 Combine like terms: 15 + -15 = 0 0 + 3a = -12 + -15 3a = -12 + -15 Combine like terms: -12 + -15 = -27 3a = -27 Divide each side by '3'. a = -9 Simplifying a = -9
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