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6x = (b-2a)x
9 = 3a +2b
6 = b -2a
9 = 3a+2b
b = 6+2a
9 - 3a= 2(6+2a)
9 - 3a = 12 + 4a
-7a = 3
a = - 3/7
b = 6 + 2*(-3/7)
b = 6 - 6/7 = 5 i 1/7