$25x^2+4y^4-20xy^2$
$\:-7+-2z+6+8z$
$14abc-21bcd-35acm$
$\frac{m^2}{n^{-3}}$
$\log\left(x+3\right)=1-\log\left(x\right)$
$-2x^{2}-x+28=0$
$x^2+2<0$
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