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4-7x=-21x+12/3
We move all terms to the left:
4-7x-(-21x+12/3)=0
We add all the numbers together, and all the variables
-7x-(-21x+4)+4=0
We get rid of parentheses
-7x+21x-4+4=0
We add all the numbers together, and all the variables
14x=0
x=0/14
x=0
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