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-7(-3x+1)-4=21x-11
We move all terms to the left:
-7(-3x+1)-4-(21x-11)=0
We multiply parentheses
21x-(21x-11)-7-4=0
We get rid of parentheses
21x-21x+11-7-4=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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