7=-1/3r

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Solution for 7=-1/3r equation: 



7=-1/3r

We move all terms to the left:

7-(-1/3r)=0



Domain of the equation: 3r)!=0

r!=0/1

r!=0

r∈R



We get rid of parentheses

1/3r+7=0

We multiply all the terms by the denominator


7*3r+1=0

Wy multiply elements

21r+1=0

We move all terms containing r to the left, all other terms to the right

21r=-1

r=-1/21

r=-1/21

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