8.4-x=3.9

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Solution for 8.4-x=3.9 equation: 



8.4-x=3.9

We move all terms to the left:

8.4-x-(3.9)=0

We add all the numbers together, and all the variables

-1x+4.5=0

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

-x=-4.5

x=-4.5/-1

x=4+0.5/1

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