$17,51+6,107$

$\frac{3}{csc\left(x\right)-cot\left(x\right)}+\frac{3}{csc\left(x\right)+cot\left(x\right)}=6\:csc\left(x\right)$

$-7+x=x-7$

$5\left(4-2\right)^2+1^2\left(2^{3-5}\right)^2$

$8z+4xy-12z$

$\sqrt[10]{243\left(2x+5\right)^5}$

$\lim\:_{x\to\:\infty\:}\frac{x^4-1}{x^3-1}$