$8x^6+7x^3-1$
$5x^2-11=5-4x^2$
$\left(7a^2b^2+5x^4\right)^2$
$\lim\:\:_{x\to0}\:\frac{\left(tanx-x\right)}{x}$
$7x^2-14x^2+x^2$
$-4x+3-x=23$
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