2/5r+9+1/5r=21

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Solution for 2/5r+9+1/5r=21 equation: 



2/5r+9+1/5r=21

We move all terms to the left:

2/5r+9+1/5r-(21)=0



Domain of the equation: 5r!=0

r!=0/5

r!=0

r∈R



We add all the numbers together, and all the variables

2/5r+1/5r-12=0

We multiply all the terms by the denominator


-12*5r+2+1=0

We add all the numbers together, and all the variables

-12*5r+3=0

Wy multiply elements

-60r+3=0

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

-60r=-3

r=-3/-60

r=1/20

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