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(x^2-3x)^2-22(x^2-3x)+72=0
We multiply parentheses
-22x^2+(x^2-3x)^2+66x+72=0
We add all the numbers together, and all the variables
-22x^2+66x+(x^2-3x)^2+72=0
We move all terms containing x to the left, all other terms to the right
-22x^2+66x+(x^2-3x)^2=-72
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