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4/5r=-4
We move all terms to the left:
4/5r-(-4)=0
Domain of the equation: 5r!=0We add all the numbers together, and all the variables
r!=0/5
r!=0
r∈R
4/5r+4=0
We multiply all the terms by the denominator
4*5r+4=0
Wy multiply elements
20r+4=0
We move all terms containing r to the left, all other terms to the right
20r=-4
r=-4/20
r=-1/5
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