$x-4>-2$
$5y+3\left(y+4\right)-7=10+4\left(2y-1\right)-y$
$\frac{d^{18}}{dx^{18}}\left(x\cdot\cos\left(x\right)\right)$
$-10x-17x$
$56-52-88$
$\lim_{x\to\infty}\left(\frac{1+x^2}{x+1}\right)^{\frac{x+5}{x}}$
$\frac{10x^3+22x^2+17x+15}{5x+6}$
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