x(.4)=100

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Solution for x(.4)=100 equation: 



x(.4)=100

We move all terms to the left:

x(.4)-(100)=0

We add all the numbers together, and all the variables

x(0.4)-100=0

We multiply parentheses

0.4x-100=0

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

0.4x=100

x=100/0.4

x=250

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