$\frac{31a}{8-\sqrt{2}}$
$z+az$
$\left(3x-7\right)\left(x+1\right)$
$6x^2y^2-12x^2y^2$
$\left(y^2-38+297\right)$
$4+\sin^2\left(x\right)=5$
$98x^2+84+18$
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