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6a-2(4a-5)=4
We move all terms to the left:
6a-2(4a-5)-(4)=0
We multiply parentheses
6a-8a+10-4=0
We add all the numbers together, and all the variables
-2a+6=0
We move all terms containing a to the left, all other terms to the right
-2a=-6
a=-6/-2
a=+3
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