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-3x+7(3x-19)=83
We move all terms to the left:
-3x+7(3x-19)-(83)=0
We multiply parentheses
-3x+21x-133-83=0
We add all the numbers together, and all the variables
18x-216=0
We move all terms containing x to the left, all other terms to the right
18x=216
x=216/18
x=12
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