If the equation ax-b-4x = 3 holds for any value of X, what is the value of 1 / 2Ab

ax-b-4x=3
Let x = 0, ax0-b-4x0 = 3, B = - 3
Let x = 1, ax1 - (- 3) - 4x1 = 3, a = 4
1/2ab=1/2x4x(-3)=-1/24

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