20=4(b-13)

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Solution for 20=4(b-13) equation: 



20=4(b-13)

We move all terms to the left:

20-(4(b-13))=0



We calculate terms in parentheses: -(4(b-13)), so:

4(b-13)

We multiply parentheses

4b-52

Back to the equation:

-(4b-52)



We get rid of parentheses

-4b+52+20=0

We add all the numbers together, and all the variables

-4b+72=0

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

-4b=-72

b=-72/-4

b=+18

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