$x^2+5x-2x>10$
$4x-3a+2y-5x+x+3a-y-y$
$x^2-2x+15=0$
$\int7x^2e^{2x+1}dx$
$x^2-3xy+y^2;\:x=-2;\:y=3$
$\int\frac{\sqrt{a^4-x^2}}{x^2}dx$
$4f^2-8f+3=0$
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