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3(2a-4)-2a=0
We add all the numbers together, and all the variables
-2a+3(2a-4)=0
We multiply parentheses
-2a+6a-12=0
We add all the numbers together, and all the variables
4a-12=0
We move all terms containing a to the left, all other terms to the right
4a=12
a=12/4
a=3
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