$-2b+9b$
$1-5a+45a-35a+5a$
$\lim_{x\to1}\left(\frac{x^2-1}{x^2+1}\right)$
$\lim_{x\to0}\left(\frac{\ln\left(\sin3x\right)}{\ln\sin x}\right)$
$2xy\frac{dy}{dx}=y\left(2\right)-x\left(2\right)$
$25x-3<30$
$12\cdot223+4\cdot$
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