$\:\frac{\:7x^2\:+\:10x\:+\:5\:\:}{x\:-\:3}\:$
$\frac{x^{4}-2x^{3}+8x+1}{x-3}$
$x+20=50$
$-1-4-4-x+y+4y$
$\lim_{x\to\infty}\left(1+\frac{2}{5x}\right)^{3x}$
$2534-146$
$\left(5x\right)^{2+8x-4}$
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