$70x+20x+-10x$
$\left(4+12\right):2$
$1-16a^4b^6c^2$
$\frac{3x}{5}-7\ge\frac{-x}{2}+4$
$\frac{1}{2x-x^2};a=1$
$m^4n^6\:-\:z^2$
$x=37.64y+0.25$
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