6-+12=3x+9

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Solution for 6-+12=3x+9 equation: 



6-+12=3x+9

We move all terms to the left:

6-+12-(3x+9)=0

We add all the numbers together, and all the variables

-(3x+9)=0

We get rid of parentheses

-3x-9=0

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

-3x=9

x=9/-3

x=-3

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