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a) 2(3a-4b+c)-5(3a+b-2c)
6a-8b+2c-15a-5b+10c
-9a-13b+12c
b)7(x+2y-3z)+4(2x-3y-5z)
7x+14y-21z+8x-12y-20z
15x+2y-41z
c)-3(-2a-4b-c)-6(a-2b-6c)
6a+12b+3c-6a+12b+36c
24b+39c
d)-5(2x+2y-6z)-(x-7y-3z)
-10x-10y+30z-x+7y+3z
-11x-3y+33z