find the sum of the following algebra expression.
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(i) x+2y+11z
(ii)4a²+5b²+2
(iii) 7ab+3bc+2ca
(iv) 2x²+3x+4
(v)7a²+11a-1
(vi)4x³+5x²+5x+9
(vii)2a³+4a²+7a+4
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