$-10h+22h-7c-10c+8r-22r$
$x^2-2+6$
$8\:-7\:+4\:.\:2\:+\:4\:\left(12\:-5\right)\:+\:7.\:\left(9\:-2\right)\:+\:9\::\:\left(-3\right)$
$-54+2$
$4x^4-16x^3+8x^2+12x$
$\int\:\:\:-2x^7e^{-x^4}\:dx$
$\lim_{x\to\infty}\left(\frac{ln\left(ln\left(x\right)\right)}{x\left(ln\left(x\right)\right)}\right)$
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