15a-13a+a-a=12

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Solution for 15a-13a+a-a=12 equation: 



15a-13a+a-a=12

We move all terms to the left:

15a-13a+a-a-(12)=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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