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Simplifying 21 + 3a = 84 Solving 21 + 3a = 84 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 = 84 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 84 + -21 3a = 84 + -21 Combine like terms: 84 + -21 = 63 3a = 63 Divide each side by '3'. a = 21 Simplifying a = 21
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