$25-5x=0$

$\frac{\left(6x^4+2x^3+4x^2+3x+8\right)}{\left(-2+8x\right)}$

$-\frac{5x^4}{7y^2\:.-2y}$

$2\log\left(x-3\right)+\log\left(x+2\right)-6\log\left(x\right)$

$y+y-3x^2$

$f\left(x\right)=\tan\left(\sqrt{3x+2}\right)\cdot\cot\left(\sqrt{3x+2}\right)$

$-21-\left(-36\right)+\left(-29\right)+7-25+\left(-34\right)+27+\left(-13\right)+39+\left(-11\right)$