$2x-7<-x$
$-6x^2+12x-20$
$\frac{8x^2-4x+2}{2x+3}$
$\lim_{x\to\infty}\left(5^x+3^x\right)^{\frac{1}{x}}$
$6.4+6.3+6.4+6.7+6.8+6.8+6.9+6.9+6.9+6.9+6.9+7.0+7.3+7.5+7.8+7.8+7.8+7.9+7.9+8.1+8.3$
$\frac{30x^3-15x^2-10x-100}{5x}$
$-60xy\:+\:-12xy$
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