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I am trying to solve this complicated two simultaneous equations, and it has been taking more than 2 hours to solve .. and it is still running... can anyone tell me what is wrong .. thanks

Solve[{((((1 - xr)/xr)^(1/2) (M2^2 xr - 1)/(

1 + (gam + 1)/2 M2^2 - M2^2 xr)) - (((1 - xm)/xm)^(1/2) (

M1^2 xm - 1)/(1 + (gam + 1)/2 M1^2 - M1^2 xm)))/(

1 + (((1 - xr)/xr)^(1/2) (M2^2 xr - 1)/(

1 + (gam + 1)/2 M2^2 - M2^2 xr)) (((1 - xm)/xm)^(1/2) (

M1^2 xm - 1)/(1 + (gam + 1)/2 M1^2 - M1^2 xm))) == tanthi,

xm - a xr == b}, {xm, xr}]

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# Mathematica taking a long time to solve

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