12.6=0.4x+x

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Solution for 12.6=0.4x+x equation: 



12.6=0.4x+x

We move all terms to the left:

12.6-(0.4x+x)=0

We add all the numbers together, and all the variables

-(+1.4x)+12.6=0

We get rid of parentheses

-1.4x+12.6=0

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

-1.4x=-12.6

x=-12.6/-1.4

x=+9

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