$-28^0$
$s^2+8s+20$
$4a-5b-6c+c-b-2a+8a+6b-3c$
$-362+2$
$\int\frac{x}{x^2-2x-15}dx$
$8a^{12}-b^3$
$3-6+8+1-10-4+2$
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