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If a =`((3),(1))`, b =`((-2),(7))`, c = `((6),(5))` and d=`((0),(-5))`, find:
(a) 3a - 2b
(b) `1/3`a + `1/3b` + `1/3`c
(c) 10a+15b+23d
(d) The scalars r and s such that ra + sc = 9b