1) (2x-3)(2x+3) -x =5x+x² -12+4x ;
4x² -9 -x =5x+x² -12+4x ;
3x² -10x +3 =0 ;
x² -(3+1/3)x +1 =0 ;
x₁ =1/3 ;
x₂ =3.(теорема Виета ).
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2) (17x +26)/(4x+3) -3 =0 ;
17x+26 -3(4x+3) =0 ;
17x+26 -12x-9 =0 ;
17 +5x =0 ;
5x = -17 ;
x =-17/5 = - 3,4.