$x^2-17x+18=0$
$2a^5+162a^3$
$2x^2+3xy-5y^2.-3xy^2+xy-5x^2$
$\sqrt[2]{4+\sqrt[3]{27}}$
$\frac{d^2y}{dx^2}+\frac{2}{x}+\frac{a^2}{y}$
$-6m+8n-m-n-6m-11$
$14=19-x$
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