3x+3.4x+x=21

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Solution for 3x+3.4x+x=21 equation: 



3x+3.4x+x=21

We move all terms to the left:

3x+3.4x+x-(21)=0

We add all the numbers together, and all the variables

7.4x-21=0

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

7.4x=21

x=21/7.4

x=2+5.1666666666667/6.1666666666667

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