$2-78+-2\cdot4$
$\int t\cdot sec^22tdt$
$1\cdot7-8+8$
$2x+y;\:x=7;\:y=107$
$3c-5-c$
$a\:=\:6,\:b\:=\:4$
$\sqrt{27}+5\sqrt{3}-2\sqrt{12}$
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