$4ab-5a$
$6^2-51+2+-12^2-8+22$
$7+2+-79$
$3\:-\:4\:\left(1\right)$
$\left(42a^2b^4\right)\left(-2a^2b\right)$
$81a^2-64b^2\cdot81a^2-64b^2$
$\frac{dy}{dt}=3t^2y$
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