9+x+4=3x-21

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Solution for 9+x+4=3x-21 equation: 



9+x+4=3x-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(3x-21)+13=0

We get rid of parentheses

x-3x+21+13=0

We add all the numbers together, and all the variables

-2x+34=0

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

-2x=-34

x=-34/-2

x=+17

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