$$2a+3b-5c; a-b+c$$
$\left(-a+b-c\right)\left(2a+3b-5c\right)$
$$\left(-a+b-c\right)\left(2a+3b-5c\right)$$
$$-2a^{2}-ab+3ac+3b^{2}-8bc+5c^{2}$$
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$2a+3b-5c,a-b+c$
