3=7x+2x

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Solution for 3=7x+2x equation: 



3=7x+2x

We move all terms to the left:

3-(7x+2x)=0

We add all the numbers together, and all the variables

-(+9x)+3=0

We get rid of parentheses

-9x+3=0

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

-9x=-3

x=-3/-9

x=1/3

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