3x=7x+21x

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Solution for 3x=7x+21x equation: 



3x=7x+21x

We move all terms to the left:

3x-(7x+21x)=0

We add all the numbers together, and all the variables

3x-(+28x)=0

We get rid of parentheses

3x-28x=0

We add all the numbers together, and all the variables

-25x=0

x=0/-25

x=0

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