$x^2-5x-28$
$5.7\cdot60$
$4x+7y+-3+2$
$6\cdot\left(-3\right)+6\cdot\left(-4\right)$
$\frac{x+3}{x+2}+\frac{x+4}{x+8}=2$
$x+1+1-3x$
$\lim_{x\to+\infty}\left(\frac{\sqrt{x^5+2x-6}}{x^3-4x+2}\right)$
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