x+x*0.8=100

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Solution for x+x*0.8=100 equation: 



x+x*0.8=100

We move all terms to the left:

x+x*0.8-(100)=0

Wy multiply elements

x+0.8x-100=0

We add all the numbers together, and all the variables

1.8x-100=0

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

1.8x=100

x=100/1.8

x=55+1/1.8

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