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3(4-5a)-2(a+4)=4
We move all terms to the left:
3(4-5a)-2(a+4)-(4)=0
We add all the numbers together, and all the variables
3(-5a+4)-2(a+4)-4=0
We multiply parentheses
-15a-2a+12-8-4=0
We add all the numbers together, and all the variables
-17a=0
a=0/-17
a=0
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