$-\frac{30}{d}-d+20,\:d=-3$
$12c-5c+3c$
$\int\frac{\left(x-1\right)}{x^2+2x+3}dx$
$4^{12}$
$8x^{12}-y^3$
$8x-0.02x^2$
$y^2+11y+1x$
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