1x+12=3x+-9

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Solution for 1x+12=3x+-9 equation: 



1x+12=3x+-9

We move all terms to the left:

1x+12-(3x+-9)=0

We add all the numbers together, and all the variables

1x-(3x-9)+12=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

x-3x+9+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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