$9z+8xy^2-5z+2y^2-15xy^2$
$2^{8^{x-2}}=4^{4^{x-1}}$
$\frac{5}{9-x^2},\:c=0$
$-9a+4a$
$24v-84$
$\lim_{x\to\frac{\pi}{2}}\left(2x\tan\left(x\right)\frac{\pi}{\cos\left(x\right)}\right)$
$3\cos\left(x-25\right)+2=0$
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