$4\left(x+5\right)-2x+34$
$xz+xyz-5=0$
$3\left(4x-7\right)+3x+9$
$\lim_{x\to4}\left(\frac{1}{x+4}-\frac{1}{\sqrt{x+4}}\right)$
$\frac{\left(5-x\right)}{\left(2-x\right)\left(1+x\right)}$
$\int_0^{\frac{n}{3}}\left(sen2xcos4x\right)dx$
$z=\ln\left(x\sqrt{x^2+y^2}\right)$
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