$4^0.4^3.4^9$
$21-\left(-21\right)$
$7x^2y-6x^2y+3xy-6xy$
$\sqrt{1^2}+0^2+\sqrt{3}^2$
$10\:x\:\left(-4\right)\:+\:5\:x\:\left(-4\right)$
$\frac{dx}{dt}=7.2-\frac{4}{\left(100-t\right)}$
$12x^2-x-20$
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