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Simplifying 21 + -1a = 3 Solving 21 + -1a = 3 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 + -1a = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 3 + -21 -1a = 3 + -21 Combine like terms: 3 + -21 = -18 -1a = -18 Divide each side by '-1'. a = 18 Simplifying a = 18
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