$10x^8\cdot9x^6$
$a^5\cdot a^2$
$2x^2+8x-7=-2$
$\int\left(7xe^{-2}\right)dx$
$\log\left(3\right)+\log\left(x^2\right)=\log\left(-5x-2\right)$
$\left(-4x+\frac{21}{10}\right)^2$
$x^2+21x+90$
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