$x^2+x^2-1$
$6x^4-3x^3$
$\log\left(3x+7\right)=0$
$300\cdot48$
$\frac{14x^4+21y^6}{5y^3}$
$\left(10a+7\right)^5$
$\left(x^4-9\right)\left(x^4+9x^2+81\right)$
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