$\left(2x\:+\:3\right)\:\left(2x\:-\:5\right)$
$17+x<-6$
$\frac{3}{2x-2}+\frac{1}{2}=\frac{2}{x-1}$
$\sin\left(x\right)\cdot\cos\left(x\right)+2\sin\left(x\right)=3\cdot\sin\left(x\right)\cdot\cos\left(x\right)$
$-345\cdot27$
$25a^6-30a^3+9$
$\:-4\left(3x+2y\right)+6\left(-2x-5y\right)$
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