a-a+2a-a=19

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Solution for a-a+2a-a=19 equation: 



a-a+2a-a=19

We move all terms to the left:

a-a+2a-a-(19)=0

We add all the numbers together, and all the variables

a-19=0

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

a=19

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