$\:2x\:+\:1.\:para\:x=-2$
$0\:y\:1$
$x^2+4x+6y-2=0$
$4.\left(-6-2\right)-2.\left(-3-1+5\right)$
$2\sin\left(\frac{1}{5}x\right)=\sqrt{2}$
$8-3\left(4-9\:x\right)$
$\lim_{x\to0}\left(\frac{\sqrt{2+x}-\sqrt{2+x}}{x}\right)$
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