$\frac{a^6b^3c^3+1}{a^2bc+1}$
$0.82-0.70$
$-10x\:+\:8\:+\:-4y\:$
$4k^2-1$
$\left(3-2b\right)^2$
$2\left(2x+9\right)$
$t\cdot\frac{dy}{dt}=4t^4-5y$
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