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Simplifying ay + 21 = x Reorder the terms: 21 + ay = x Solving 21 + ay = x 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 + ay = -21 + x Combine like terms: 21 + -21 = 0 0 + ay = -21 + x ay = -21 + x Divide each side by 'y'. a = -21y-1 + xy-1 Simplifying a = -21y-1 + xy-1 Reorder the terms: a = xy-1 + -21y-1
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