4(b-13)=20

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



4(b-13)=20

We move all terms to the left:

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

We multiply 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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