$15c^2-d^2+60c^2-f$
$-4\cdot\left(5-6\right)$
$\frac{x^4+12x^3+2x^5+3x+6}{x^2+x-1}$
$-6789+456+789+1234+90$
$-6z+1+16z^2$
$\:14xy\:ala\:22-\:38xala\:3\:+\:56\:sala9$
$\cos\left(x+y\right)+\sin\left(x-y\right)$
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