$17x+13=32-2x$
$\lim_{x\to1}5x+2$
$25x^4-25y^4$
$\frac{c+1}{-3}=-21$
$\sin\left(x\right)\:x\:sec\:x\:=tg\:x$
$\frac{cot\left(x\right)}{csc\left(x\right)+1}$
$27+n^6$
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