$7x^2\:-\:25x\:+\:15\:\ge\:0$
$-40cd+16c^2+25d^2$
$\frac{9x^4-x}{x^2+1}$
$5a^2-10a$
$5-6+\left(4\cdot3^2\right)$
$2xy+x$
$\frac{32x^2y^3}{2x}+\frac{14x^5y^5}{2x^4y^4}$
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