$\frac { x ^ { 2 } } { 2 x ^ { 2 } - 2 x - 4 }$
$3z^2+z$
$7y+14x$
$\int\left(x^2-2x\right)\cdot e^xdx$
$\left(x^4+3x\right)\cdot lnx$
$\:3x^2-2x+4$
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