$2\sqrt{5}-4\sqrt{3}+7\sqrt{5}$
$5\sqrt{2}-9\sqrt{2}+7\sqrt{2}$
$-3\sqrt{7}-8\sqrt{7}+\sqrt{7}$
$-\left(-5\right)-\left(-2\right)$
$-2\cdot-1\cdot3+2\cdot1$
$-\left(-2\right).5\:-\:3.\:\left(-4\right)$
$1\cdot2-\left(-3\right)\cdot2$
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