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8a-4a+2a+2a-5a=3
We move all terms to the left:
8a-4a+2a+2a-5a-(3)=0
We add all the numbers together, and all the variables
3a-3=0
We move all terms containing a to the left, all other terms to the right
3a=3
a=3/3
a=1
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