12+x=3x+72=6

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Solution for 12+x=3x+72=6 equation: 



12+x=3x+72=6

We move all terms to the left:

12+x-(3x+72)=0

We get rid of parentheses

x-3x-72+12=0

We add all the numbers together, and all the variables

-2x-60=0

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

-2x=60

x=60/-2

x=-30

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