6.9+(-7.21)=x

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Solution for 6.9+(-7.21)=x equation: 



6.9+(-7.21)=x

We move all terms to the left:

6.9+(-7.21)-(x)=0

We add all the numbers together, and all the variables

-1x-0.31=0

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

-x=0.31

x=0.31/-1

x=-0.31/1

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