-(5a-2b+c)-2(3a-5(a-2b-3c)-2)

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-(5a-2b+c)-2(3a-5(a-2b-3c)-2)

-(5a-2b+c)-2(3a-5(a-2b-3c)-2)
-(5a-2b+c)-2(3a-5(a-2b-3c)-2)

-(5a-2b+c)-2(3a-5(a-2b-3c)-2)
-(5a-2b+c)-2(3a-5(a-2b-3c)-2)
=-5a+2b-c-2(3a-5a+10b+15c-2)
=-5a+2b-c-6a+10a-20b-15c+2
=-a-18b-16c+2
=2-a-18b-16c