30=3x+7x

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Solution for 30=3x+7x equation: 



30=3x+7x

We move all terms to the left:

30-(3x+7x)=0

We add all the numbers together, and all the variables

-(+10x)+30=0

We get rid of parentheses

-10x+30=0

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

-10x=-30

x=-30/-10

x=+3

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