$-30\cdot30$
$2a+15a-11a$
$-3xy-3y-3y$
$\int\sqrt{4-u^2}dx$
$\lim_{t\to0}\left(\frac{5^t-2^t}{t}\right)$
$\left(b+5y\right)^2$
$\frac{27x^6-8y^9}{3x^2-2y^3}$
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