87=7x-4

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Solution for 87=7x-4 equation: 



87=7x-4

We move all terms to the left:

87-(7x-4)=0

We get rid of parentheses

-7x+4+87=0

We add all the numbers together, and all the variables

-7x+91=0

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

-7x=-91

x=-91/-7

x=+13

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