$x^2+x+1<0$
$\:\left(5b-7\right)^2$
$4x^4+8x^2+16$
$\left(-ab^2c\right)^3\left(-2^3ab^3c^2\right)^2$
$x^3+x^2y-xy^2+y^3;x=1;x=2$
$2x+1>3$
$\left(3x-\frac{1}{2}\right)\left(2+3x\right)$
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