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(2x^2-3x-1)^2-3(2x^2-3x-5)-16=0
We multiply parentheses
-6x^2+(2x^2-3x-1)^2+9x+15-16=0
We add all the numbers together, and all the variables
-6x^2+9x+(2x^2-3x-1)^2-1=0
We move all terms containing x to the left, all other terms to the right
-6x^2+9x+(2x^2-3x-1)^2=1
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