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[4 a] [b 1] [- 3 4b] [3 5]
[a+2b+1 - 4 ] = [5 - 4]
[9 + ab a + 4b] [3 5]
a + 2b + 1 = 5
a + 2b = 4
a + 4b = 5
________ -
2b = 1
b = 1/2
a = 3
2b - a = 2(1/2) - 3 = - 2