Q12. If X= 3a +3b +5c; Y = - 7a + 2b – 2c and Z = -a + 7c, find (i) X + Y + Z
(ii) X – Y
(iii) Y – Z
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Q12. If X= 3a +3b +5c; Y = - 7a + 2b – 2c and Z = -a + 7c, find (i) X + Y + Z
(ii) X – Y
(iii) Y – Z
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