90-x=0.8x

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Solution for 90-x=0.8x equation: 



90-x=0.8x

We move all terms to the left:

90-x-(0.8x)=0

We add all the numbers together, and all the variables

-x-(+0.8x)+90=0

We add all the numbers together, and all the variables

-1x-(+0.8x)+90=0

We get rid of parentheses

-1x-0.8x+90=0

We add all the numbers together, and all the variables

-1.8x+90=0

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

-1.8x=-90

x=-90/-1.8

x=+50

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