$\left(\frac{1}{2}-\frac{3}{4}b\right)^3$
$4a^2+25b^2-20ab$
$100b^2-180bm+81m^2$
$25x-18>0$
$\lim_{x\to4}\left(\frac{x^2-10x+24}{x^2-8x+16}\right)$
$x^2y-3xy'+4y=0$
$10x-1=9x-75$
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