$1x+6x^{3}-10x^{2}-30\text{entre}2x+6$
$4x-6y+z-5z+6x-4y+3x$
$8\:x\:-6$
$\frac{\left(x^2-40x-65\right)}{x^2-25}\:-\:\frac{\left(4x+4\right)}{x+5}$
$\int\left(9\left(15x+6\right)^7\right)dx$
$316.09\cdot0.01$
$\left(y^2-xy\right)dx=x^2dy$
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