$t^2\frac{dx}{dt}+3tx=t^4\ln\:\:\left(t+1\right)$
$3x+15xy+9y$
$25t^2-25t+6$
$2\cdot\left(2\right)+2\cdot\left(-1\right)$
$56.52+141.3+47.1$
$-86+-89$
$\left(m-5\right)\left(m+11\right)$
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