9+7x=4x+21

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Solution for 9+7x=4x+21 equation: 



9+7x=4x+21

We move all terms to the left:

9+7x-(4x+21)=0

We get rid of parentheses

7x-4x-21+9=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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