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1/4r=10
We move all terms to the left:
1/4r-(10)=0
Domain of the equation: 4r!=0We multiply all the terms by the denominator
r!=0/4
r!=0
r∈R
-10*4r+1=0
Wy multiply elements
-40r+1=0
We move all terms containing r to the left, all other terms to the right
-40r=-1
r=-1/-40
r=1/40
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