87=b+20

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Solution for 87=b+20 equation: 



87=b+20

We move all terms to the left:

87-(b+20)=0

We get rid of parentheses

-b-20+87=0

We add all the numbers together, and all the variables

-1b+67=0

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

-b=-67

b=-67/-1

b=+67

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