Question 22690
1/12 + 1/x = 1/5
=> 1/x = 1/5 – 1/12
=> 1/x =  (12 – 5)/60
=> 1/x = 7/60
=>  x = 60/7
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16/(x-3) – 24/(x+4) + 13
=> 16/(x-3) – 24/(x+4) + 13 = 0
=> 16(x+4)-24(x-3) + 13(x-3)(x+4) =0
=> 16(x+4)-24(x-3) + 13( x^2 + x -12) =0
=> 13(x^2) + 5x – 20 = 0
=> x = [-5 (+/-) ( 25 - 4*13*(-20))^(1/2)]/2*13
  x= [-5(*/-) 32.63]/26
  X1= 1.6  or  X2= - 1.44