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b = 7-3c
=> a = -(7-3c)+6
a = 3c-1
=> -(3c-1) -2(7-3c) -2c = -1
-3c+6c-2c +1-14 = -1
c = -1 +13
c = 12
=> b = 7-3(12)
b = 7-36
b = -29
=> a = 3(12)-1
a = 36-1
a = 35