Question: =) (15a) 2 + (3b) + (5c)2- (15a) (5c) - (15a) (3b) - (3b) (5c)=0
=) (15a) 2 + (3b) + (5c)2- (15a) (5c) - (15a) (3b) - (3b) (5c)=0
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