12.1-7.9=x

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Solution for 12.1-7.9=x equation: 



12.1-7.9=x

We move all terms to the left:

12.1-7.9-(x)=0

We add all the numbers together, and all the variables

-1x+4.2=0

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

-x=-4.2

x=-4.2/-1

x=4+0.2/1

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