(a) R-4=0 ( 4,- 4 , 8, 0
(b) X + 4 = 2( - 2 , 0, 2, 4)
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(a) R-4=0 ( 4,- 4 , 8, 0
(b) X + 4 = 2( - 2 , 0, 2, 4)
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