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Question Stats:
55% (02:25) correct 45% (02:52) wrong based on 178 sessionsWe will have two cases  
Case 1: z30  43 = +36 => z30 = 36 + 43 = 79 => z30 = +79 or z30 = 79 => z = 79 + 30 or z = 79 + 30 => z = 109 or 49 Remainder(r) when 109 is divided by 7 = 4 Remainder(r) when 49 is divided by 7 = 0  Case 2: z30  43 = 36 => z30 = 36 + 43 = 7 => z30 = +7 or z30 = 7 => z = 7 + 30 or z = 7 + 30 => z = 37 or 23 Remainder(r) when 37 is divided by 7 = 2 Remainder(r) when 23 is divided by 7 = 2 

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