x-9+x=12

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Solution for x-9+x=12 equation: 



x-9+x=12

We move all terms to the left:

x-9+x-(12)=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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