5b+20=7b-80

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Solution for 5b+20=7b-80 equation: 



5b+20=7b-80

We move all terms to the left:

5b+20-(7b-80)=0

We get rid of parentheses

5b-7b+80+20=0

We add all the numbers together, and all the variables

-2b+100=0

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

-2b=-100

b=-100/-2

b=+50

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