$1.4+x=25\:$
$\:\left(3x-y^2\right)^4$
$\frac{d}{dx}r^2+s^2+rs=1$
$\frac{16}{0.37}$
$\left(9x^2+5x\right)x\left(9x^2-5x\right)$
$-18\cdot13$
$3x+6<-7$
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