$y^2=0$
$80:-90$
$\lim_{x\to+\infty}\left(x^2-x^3+6x^5-x^7\right)$
$t^2-t+7$
$\left(8x^2-4\right)^3$
$4\left(5x^3+1\right)^2$
$4x^2+84x-43=0$
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