(3a-c)+(-2a-c)-(2a+b-c+5)+(2a-b+c+5)-2
=3a-c-2a-c-2a-b+c-5+2a-b+c+5-2bc
=(3a-2a-2a+2a)-(b+b)+(c+c-c-c)-(5+5)-2bc
=a-2b-2bc
=(-3)-2*(-5)-2*(-5)*(1/5)
=9
(3a-c)+(-2a-c)-(2a+b-c+5)+(2a-b+c+5)-2
=3a-c-2a-c-2a-b+c-5+2a-b+c+5-2bc
=(3a-2a-2a+2a)-(b+b)+(c+c-c-c)-(5+5)-2bc
=a-2b-2bc
=(-3)-2*(-5)-2*(-5)*(1/5)
=9