x-x(.90)=40

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Solution for x-x(.90)=40 equation: 



x-x(.90)=40

We move all terms to the left:

x-x(.90)-(40)=0

We add all the numbers together, and all the variables

x-x(0.9)-40=0

We multiply parentheses

x-0.9x-40=0

We add all the numbers together, and all the variables

0.1x-40=0

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

0.1x=40

x=40/0.1

x=400

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