a+2a-2a-12a=13

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Solution for a+2a-2a-12a=13 equation: 



a+2a-2a-12a=13

We move all terms to the left:

a+2a-2a-12a-(13)=0

We add all the numbers together, and all the variables

-11a-13=0

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

-11a=13

a=13/-11

a=-1+2/11

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