$7-3\cdot1$
$\left(2x+3\right)+\left(7-2y\right)+\left(2x+3\right)+\left(7-2y\right)$
$\int\:3sech^2\left(3x-2\right)dx$
$6x-4b$
$3x^2y+3xy^4$
$-14\:\left(-5\right)\:+\:5\:$
$\int\sqrt{1+\sqrt{1+z}}dz$
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