12=1x+3

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Solution for 12=1x+3 equation: 



12=1x+3

We move all terms to the left:

12-(1x+3)=0

We add all the numbers together, and all the variables

-(x+3)+12=0

We get rid of parentheses

-x-3+12=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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