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3(a+2b-3c)+7(2a-4b+5c) -5(-3a-4b-5c)= 3a+6b-9c+14a-28b+35c+15a+20b+25c=32a+54b+51c
2/3 (3a +6b-12c)+ 3/5 (10a-15b+20c) =2a+4b-8c+3a-9b+12c=5a-5b+4c
8x - 24y - 20z - 72x - 64y + 56z + 15x - 30y + 45z =
- 49x - 188y + 81z
3(a+2b-3c)+7(2a-4b+5c) -5(-3a-4b-5c)=
3a +6b - 9c + 14a - 28b + 35c +15a + 20b + 25c =
32a - 2b + 51c
2/3 (3a +6b-12c)+ 3/5 (10a-15b+20c) =
2a + 4b - 8c + 6a - 9b + 12c =
8a - 5b + 4c