$13x^2z+2x^2z-x^2z-20x^2z$
$sinx-sin3x$
$\sqrt[2]{4+\sqrt[3]{27}}$
$\left(1+\frac{1}{x}^x\right)$
$\frac{12}{11x+2}<8$
$i ^ { 0 }$
$4x+10<-2x-8$
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