6a : x = 12/3 = 4, b : x = 28/7 = 4, c : x = 72/9 = 8 7a : x = -30/-5 = 6, b : x = 24/-3 = -8 8a : x = -13/5, b : x = 17/3, c : x = -5/7 9a : x = 5*3 = 15, b : x = -3*7 = -21, c : x = -12*(5/3) = -20 10a : x = 7*5 = 35, b : x = -3*-7 = 21, c : x = -4*(3/2) = -6 11a : x = 21, b : x = -22, c : x = 2/7
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6a : x = 12/3 = 4, b : x = 28/7 = 4, c : x = 72/9 = 8
7a : x = -30/-5 = 6, b : x = 24/-3 = -8
8a : x = -13/5, b : x = 17/3, c : x = -5/7
9a : x = 5*3 = 15, b : x = -3*7 = -21, c : x = -12*(5/3) = -20
10a : x = 7*5 = 35, b : x = -3*-7 = 21, c : x = -4*(3/2) = -6
11a : x = 21, b : x = -22, c : x = 2/7