12=7x+9

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Solution for 12=7x+9 equation: 



12=7x+9

We move all terms to the left:

12-(7x+9)=0

We get rid of parentheses

-7x-9+12=0

We add all the numbers together, and all the variables

-7x+3=0

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

-7x=-3

x=-3/-7

x=3/7

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