4. Find the sum of the expressions given in each of the following.
(i) 2a-3b, 4a +6b and a + b
(ii) 7x - 13y, 2 x +y and llx - 3y
(iii) a-b,b-c and c-a
(iv) x - y +2 z, 3x -6y - 7z and 8z-3y + 2x
(v) 2x +y -5, 7x - 3y + 7 and 8x +12y +19
(vi) 2ab +3bc +6ca, 3ab-5bc -16ca and -5ab+2bc +10ca
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