$-4+9+9-4-6+6-5-8$
$.48\cdot\frac{5}{6}$
$( - 3 x ^ { - 4 } y ^ { 6 } z ^ { - 4 } ) ( 2 x ^ { 3 } y z ^ { 3 } )$
$\int x^2\arctan\left(2x\right)dx$
$\left(ab+3\right)\left(3-ab\right)$
$67\:+\:399\:=\:$
$x-5>3x+7$
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