7x-7=13=12x

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Solution for 7x-7=13=12x equation: 



7x-7=13=12x

We move all terms to the left:

7x-7-(13)=0

We add all the numbers together, and all the variables

7x-20=0

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

7x=20

x=20/7

x=2+6/7

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