0.7+x=3.9

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Solution for 0.7+x=3.9 equation: 



0.7+x=3.9

We move all terms to the left:

0.7+x-(3.9)=0

We add all the numbers together, and all the variables

x-3.2=0

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

x=3.2

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