3x+3.9=8.4

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Solution for 3x+3.9=8.4 equation: 



3x+3.9=8.4

We move all terms to the left:

3x+3.9-(8.4)=0

We add all the numbers together, and all the variables

3x-4.5=0

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

3x=4.5

x=4.5/3

x=1+1/2

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