12-2x=-9

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Solution for 12-2x=-9 equation: 



12-2x=-9

We move all terms to the left:

12-2x-(-9)=0

We add all the numbers together, and all the variables

-2x+21=0

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

-2x=-21

x=-21/-2

x=10+1/2

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