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-2b = 3
b = - 3/2
2a - 3b = 6
2a - 3 (-3/2) = 6
2a + 9/2 = 6
2a = 6 - 4,5
2a = 1,5
a = 1,5/2
jdi a- 2b = (1,5/2) - 2.(-3/2)
(1,5 + 6)/2 = 7,5/2