20=4b+7

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Solution for 20=4b+7 equation: 



20=4b+7

We move all terms to the left:

20-(4b+7)=0

We get rid of parentheses

-4b-7+20=0

We add all the numbers together, and all the variables

-4b+13=0

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

-4b=-13

b=-13/-4

b=3+1/4

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