2.5+x+3.9=8.4

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Solution for 2.5+x+3.9=8.4 equation: 



2.5+x+3.9=8.4

We move all terms to the left:

2.5+x+3.9-(8.4)=0

We add all the numbers together, and all the variables

x-2=0

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

x=2

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