87=3-7u

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Solution for 87=3-7u equation: 



87=3-7u

We move all terms to the left:

87-(3-7u)=0

We add all the numbers together, and all the variables

-(-7u+3)+87=0

We get rid of parentheses

7u-3+87=0

We add all the numbers together, and all the variables

7u+84=0

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

7u=-84

u=-84/7

u=-12

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