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21/4=k=-13/10
We move all terms to the left:
21/4-(k)=0
We add all the numbers together, and all the variables
-1k+21/4=0
We multiply all the terms by the denominator
-1k*4+21=0
Wy multiply elements
-4k+21=0
We move all terms containing k to the left, all other terms to the right
-4k=-21
k=-21/-4
k=5+1/4
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