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-4a+18a-2a+4a-6a=20
We move all terms to the left:
-4a+18a-2a+4a-6a-(20)=0
We add all the numbers together, and all the variables
10a-20=0
We move all terms containing a to the left, all other terms to the right
10a=20
a=20/10
a=2
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