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21/2x=25
We move all terms to the left:
21/2x-(25)=0
Domain of the equation: 2x!=0We multiply all the terms by the denominator
x!=0/2
x!=0
x∈R
-25*2x+21=0
Wy multiply elements
-50x+21=0
We move all terms containing x to the left, all other terms to the right
-50x=-21
x=-21/-50
x=21/50
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