-87=4+7x

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Solution for -87=4+7x equation: 



-87=4+7x

We move all terms to the left:

-87-(4+7x)=0

We add all the numbers together, and all the variables

-(7x+4)-87=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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