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