12x+6=12-15-9x

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Solution for 12x+6=12-15-9x equation: 



12x+6=12-15-9x

We move all terms to the left:

12x+6-(12-15-9x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

12x+9x+3+6=0

We add all the numbers together, and all the variables

21x+9=0

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

21x=-9

x=-9/21

x=-3/7

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