7b-20=9b-28

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Solution for 7b-20=9b-28 equation: 



7b-20=9b-28

We move all terms to the left:

7b-20-(9b-28)=0

We get rid of parentheses

7b-9b+28-20=0

We add all the numbers together, and all the variables

-2b+8=0

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

-2b=-8

b=-8/-2

b=+4

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