9=4.2+x

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Solution for 9=4.2+x equation: 



9=4.2+x

We move all terms to the left:

9-(4.2+x)=0

We add all the numbers together, and all the variables

-(x+4.2)+9=0

We get rid of parentheses

-x-4.2+9=0

We add all the numbers together, and all the variables

-1x+4.8=0

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

-x=-4.8

x=-4.8/-1

x=4+0.8/1

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