x*0.8=100

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Solution for x*0.8=100 equation: 



x*0.8=100

We move all terms to the left:

x*0.8-(100)=0

Wy multiply elements

0.8x-100=0

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

0.8x=100

x=100/0.8

x=125

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