3x+0.4=21.4

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Solution for 3x+0.4=21.4 equation: 



3x+0.4=21.4

We move all terms to the left:

3x+0.4-(21.4)=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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