$3x^2-9x-7+x^2+4x+6+8x^2$
$6a\left(x+1\right)+8a\left(x+1\right)$
$100-45x^2+x^4$
$\frac{d}{dx}4y$
$\left(x^4+5\right)\left(x^4+8\right)$
$x^2-17x+70$
$54-6\ln x$
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