100=(100*0.8)x

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Solution for 100=(100*0.8)x equation: 



100=(100*0.8)x

We move all terms to the left:

100-((100*0.8)x)=0

We add all the numbers together, and all the variables

-(80x)+100=0

We add all the numbers together, and all the variables

-80x+100=0

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

-80x=-100

x=-100/-80

x=1+1/4

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