$9\cdot5-100y^2$
$\frac{7b^6}{28d^6}$
$3\:w+7=19$
$2l+2w=p$
$-\frac{4}{5}-\frac{6}{5}$
$2a^2+4+8+3a^2$
$3\sqrt{2}\cos\left(x\right)+2=-1$
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