20r+30=40r-40

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Solution for 20r+30=40r-40 equation: 



20r+30=40r-40

We move all terms to the left:

20r+30-(40r-40)=0

We get rid of parentheses

20r-40r+40+30=0

We add all the numbers together, and all the variables

-20r+70=0

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

-20r=-70

r=-70/-20

r=3+1/2

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