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-7(3x-1)+9=-21x+16
We move all terms to the left:
-7(3x-1)+9-(-21x+16)=0
We multiply parentheses
-21x-(-21x+16)+7+9=0
We get rid of parentheses
-21x+21x-16+7+9=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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