$x-10x+26$
$9f+10f+12f$
$\frac{d}{dx}\frac{2}{3x^5}$
$1\cdot9a^2$
$5x^2-30x-35$
$-9n^4+8-9n^4+2n^3+5n^2$
$\left(-12\right)+\left(+23\right)-\left(-5\right)+\left(-45\right)$
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