121=91+k

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Solution for 121=91+k equation:


121=91+k

We simplify the equation to the form, which is simple to understand 
121=91+k

We move all terms containing k to the left and all other terms to the right. 
-1k=+91-121

We simplify left and right side of the equation. 
-1k=-30

We divide both sides of the equation by -01 to get k. 
k=30

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