90=12.8xX

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Solution for 90=12.8xX equation: 



90=12.8xx

We move all terms to the left:

90-(12.8xx)=0

We add all the numbers together, and all the variables

-(+12.8xx)+90=0

We get rid of parentheses

-12.8xx+90=0

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

-12.8xx=-90

x=-90/1

x=-90

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