$\left(3k\right)^5\left(3k\right)^4$
$f\left(x\right)=\frac{e^{x\sqrt{x^2+1}}}{e^{2x+1}}$
$-19x+19z+15x-31z$
$x+12x+35$
$6a-48=6$
$\frac{12+r-r^2}{r^3+3r^3}$
$\sqrt{8ab}+\sqrt{72ab}+\sqrt{50ab}-\sqrt{288ab}$
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