87=3(b-40)

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Solution for 87=3(b-40) equation: 



87=3(b-40)

We move all terms to the left:

87-(3(b-40))=0



We calculate terms in parentheses: -(3(b-40)), so:

3(b-40)

We multiply parentheses

3b-120

Back to the equation:

-(3b-120)



We get rid of parentheses

-3b+120+87=0

We add all the numbers together, and all the variables

-3b+207=0

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

-3b=-207

b=-207/-3

b=+69

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