$4x^4-36y^2$
$6x^2+5xy-9y^2;\:x=3;\:y=1$
$30-\left(-22\right)$
$36\cdot x^2+120\cdot x+100$
$\frac{3x^2-2x^2+4x-10}{x+3}$
$6-7-5.5$
$\frac{x-1}{\sqrt{3x-2-1}}$
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