3x+-9=1x+12

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



3x+-9=1x+12

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

3x-(x+12)=0

We get rid of parentheses

3x-x-12=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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