$-3\left(x-y\right)$
$4+13+1+-8$
$4x-1<11$
$121-x^2$
$\frac { x _ { 1 } } { x _ { 1 } }$
$\frac{6}{y-2}-\frac{3}{y}=\frac{5y+2}{y^2-4}$
$\left(3x-y\right)^3$
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