40r+120=20r+180

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Solution for 40r+120=20r+180 equation: 



40r+120=20r+180

We move all terms to the left:

40r+120-(20r+180)=0

We get rid of parentheses

40r-20r-180+120=0

We add all the numbers together, and all the variables

20r-60=0

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

20r=60

r=60/20

r=3

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