$9x^2-12y=0$
$x^2-10=0$
$\left(12x-19y-3\right)-\left(7x+15y+8\right)$
$0=x^2-6x+3$
$2\csc\left(x\right)^2=\frac{1}{1+\cos\left(x\right)}+\frac{1}{1-\cos\left(x\right)}$
$x^2-200x+100$
$k^2-2k-48$
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