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9x^2-15x-21x+35=9x^2-36x+35
We move all terms to the left:
9x^2-15x-21x+35-(9x^2-36x+35)=0
We add all the numbers together, and all the variables
9x^2-36x-(9x^2-36x+35)+35=0
We get rid of parentheses
9x^2-9x^2-36x+36x-35+35=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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