$50+2x<6x$
$\int x^{\frac{1}{2}}\left(\frac{5}{54}x^{\frac{3}{2}}+25\right)^{\frac{1}{2}}dx$
$3x^2-4x+4$
$8k^2+80x+200$
$m-7n=9$
$-10xy\left(-9+4x\right)$
$\frac{10\sin^2\theta-7\cos\theta+2}{3+2\cos\theta}=4-5\cos\theta$
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