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4/5k=84
We move all terms to the left:
4/5k-(84)=0
Domain of the equation: 5k!=0We multiply all the terms by the denominator
k!=0/5
k!=0
k∈R
-84*5k+4=0
Wy multiply elements
-420k+4=0
We move all terms containing k to the left, all other terms to the right
-420k=-4
k=-4/-420
k=1/105
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