$47\cdot4$
$\left(\frac{3x^2y}{2xy^4}\right)^3$
$\frac{7}{2}=\frac{7x}{2}$
$55,82-1,19$
$8x-6=42$
$3 - 2 ( x - 1 ) \leq 2 ( 4 + x )$
$-37=45+r$
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