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-2(a-4)=6
We move all terms to the left:
-2(a-4)-(6)=0
We multiply parentheses
-2a+8-6=0
We add all the numbers together, and all the variables
-2a+2=0
We move all terms containing a to the left, all other terms to the right
-2a=-2
a=-2/-2
a=1
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