3-12=12-2x

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Solution for 3-12=12-2x equation: 



3-12=12-2x

We move all terms to the left:

3-12-(12-2x)=0

We add all the numbers together, and all the variables

-(-2x+12)+3-12=0

We add all the numbers together, and all the variables

-(-2x+12)-9=0

We get rid of parentheses

2x-12-9=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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