$290-\left(-900\right)$
$6,n\:2,m\:3,x\:1,y\:3.$
$4x-3\cdot\left(2x-1\right)>5x-2\cdot\left(x+2\right)$
$si\:x=0$
$6.\left(-4\right)-2.\left(-8\right)+5.3-9\left(-2\right)$
$\frac{y}{2}+1=3$
$x^2-x-2>0$
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