87=x-x(.85)

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Solution for 87=x-x(.85) equation: 



87=x-x(.85)

We move all terms to the left:

87-(x-x(.85))=0

We add all the numbers together, and all the variables

-(x-x(0.85))+87=0



We calculate terms in parentheses: -(x-x(0.85)), so:

x-x(0.85)

We multiply parentheses

x-0.85x

We add all the numbers together, and all the variables

0.15x

Back to the equation:

-(0.15x)



We add all the numbers together, and all the variables

-(+0.15x)+87=0

We get rid of parentheses

-0.15x+87=0

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

-0.15x=-87

x=-87/-0.15

x=+580

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