-87=13-4x

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Solution for -87=13-4x equation: 



-87=13-4x

We move all terms to the left:

-87-(13-4x)=0

We add all the numbers together, and all the variables

-(-4x+13)-87=0

We get rid of parentheses

4x-13-87=0

We add all the numbers together, and all the variables

4x-100=0

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

4x=100

x=100/4

x=25

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