Hi,

Solving

 7x^2=168+35x. 

 7x^2-35x-168 = 0 

 7(x^2-5x-24) = 0 

 (x -8)(x+3) = 0

 (x-8) = 0

  x = 8

 (x+3)=0

  x = -3 

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