$\frac{2x^4-7x^3+4x^2+4}{2x^2-3x-2}$
$-7w-5+17w+15$
$\left(-6wu^4\right)^2$
$y^{14}+18y^7+81$
$m^{\text{4}}n^4-1$
$2+-6+1$
$3x^2-x-5=0$
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