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