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Simplifying 18 + -1a = 21 Solving 18 + -1a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1a = 21 + -18 Combine like terms: 18 + -18 = 0 0 + -1a = 21 + -18 -1a = 21 + -18 Combine like terms: 21 + -18 = 3 -1a = 3 Divide each side by '-1'. a = -3 Simplifying a = -3
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