19 - 15 - - - - = a 21 - 18-3-0 -25- (-24)-(-1) - 0 A3 - 3A2 - A - 31 = [0]3x3 a + b + 2c b LAQ7. Show that b + c + 2a b = 2(a + b + c) c + a + 2b la+b+ 20 b B с с a
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543
19-15=
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