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Let two circles S1=0 and S2=0 intersect ...

Let two circles `S_1=0` and `S_2=0` intersect at point A and B . `L_1=0` is the line joining A and B where `S_1=x^2+y^2+2ax+2by-5=0` and `S_2=x^2+y^2+2x+4y-4=0` Let AB subtend and angle `theta` at (0,0) and angle subtended by `S_1=0` and `S_2=0` at P(3,4) is `alpha` and `beta` respectively.
If equation of `L_1=3x+4y=7`, then the value of 4a-b is equal to

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