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7x-9=3x-9+4x
We move all terms to the left:
7x-9-(3x-9+4x)=0
We add all the numbers together, and all the variables
7x-(7x-9)-9=0
We get rid of parentheses
7x-7x+9-9=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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