18a-a-3a-13a=12

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Solution for 18a-a-3a-13a=12 equation: 



18a-a-3a-13a=12

We move all terms to the left:

18a-a-3a-13a-(12)=0

We add all the numbers together, and all the variables

a-12=0

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

a=12

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