180=21+3r-3+5r

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Solution for 180=21+3r-3+5r equation: 



180=21+3r-3+5r

We move all terms to the left:

180-(21+3r-3+5r)=0

We add all the numbers together, and all the variables

-(8r+18)+180=0

We get rid of parentheses

-8r-18+180=0

We add all the numbers together, and all the variables

-8r+162=0

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

-8r=-162

r=-162/-8

r=20+1/4

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