3x+4x+x=21

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Solution for 3x+4x+x=21 equation: 



3x+4x+x=21

We move all terms to the left:

3x+4x+x-(21)=0

We add all the numbers together, and all the variables

8x-21=0

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

8x=21

x=21/8

x=2+5/8

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