$27a^3+64b^3$
$\left(x^2-x+1\right)\left(2x^2+3x-4\right)$
$\left(8x^3+y^6\right)$
$-5a+2x-4x$
$\int_1^9\left(\frac{\sqrt{u}-2u^2}{u}\right)dx$
$w=\ln\left(x+y+z\right)$
$13-20+3\left[12\:-3\left(\:4\right)+\:2\left(\:4-5\right)-7\left(8+\:2\right)-10\right]\:-12\:$
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