+4=r/20-5

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Solution for +4=r/20-5 equation: 



+4=r/20-5

We move all terms to the left:

+4-(r/20-5)=0

We get rid of parentheses

-r/20+5+4=0

We multiply all the terms by the denominator


-r+5*20+4*20=0

We add all the numbers together, and all the variables

-1r+180=0

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

-r=-180

r=-180/-1

r=+180

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