$12^2-4\left(2\right)\left(8\right)$
$7+6m\sqrt{1}$
$x^2\:-\:14x\:+\:49\:=\:16$
$-0,5\:x\:-0,5$
$2.028\cdot0.5$
$6g^2-11g-10$
$\left(2+7\sqrt{7}\right)\left(2-7\sqrt{7}\right)$
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