18a+2a+2a-20a-a=15

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Solution for 18a+2a+2a-20a-a=15 equation: 



18a+2a+2a-20a-a=15

We move all terms to the left:

18a+2a+2a-20a-a-(15)=0

We add all the numbers together, and all the variables

a-15=0

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

a=15

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