$\frac{\left(2x^2-23+66\right)}{\left(2x^2+x+1\right)}$
$s^2-5s-5$
$8-5z=-10-2z$
$0,615\:por\:13$
$y^4+22y^2+121$
$\left(2x+3y-5\right)^2$
$-x^2=-3x-18$
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