$x\ln\left(xy\right)-\ln\left(x\right)=0$
$\left(x\:+2\right)\left(7x\:-2\right)$
$a-5+5$
$f\left(x\right)=x^2+x\:\:\:\:g\left(x\right)=-2x^2-1$
$4x+1<2x$
$\left(\frac{9}{5}y^2-10x^4\right)^2$
$3x+4y=0$
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