x(.8)=500

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Solution for x(.8)=500 equation: 



x(.8)=500

We move all terms to the left:

x(.8)-(500)=0

We add all the numbers together, and all the variables

x(0.8)-500=0

We multiply parentheses

0.8x-500=0

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

0.8x=500

x=500/0.8

x=625

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