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-21=k-3/4
We move all terms to the left:
-21-(k-3/4)=0
We add all the numbers together, and all the variables
-(+k-3/4)-21=0
We get rid of parentheses
-k-21+3/4=0
We multiply all the terms by the denominator
-k*4+3-21*4=0
We add all the numbers together, and all the variables
-k*4-81=0
Wy multiply elements
-4k-81=0
We move all terms containing k to the left, all other terms to the right
-4k=81
k=81/-4
k=-20+1/4
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