$y\:-9\:=13$
$-6\left(a-1\right)$
$3ax-6a^2$
$12a-8a+10a+3a-18a+5a$
$t^2.\left(\frac{dx}{dt}\right)=-x$
$3\left(4xy^3\right)$
$x^{12}+64y^6z^9$
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