15.21-3.9-4.7+6.79=x

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Solution for 15.21-3.9-4.7+6.79=x equation: 



15.21-3.9-4.7+6.79=x

We move all terms to the left:

15.21-3.9-4.7+6.79-(x)=0

We add all the numbers together, and all the variables

-1x+13.4=0

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

-x=-13.4

x=-13.4/-1

x=13+0.4/1

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