Question

(х-2) (х-3)-(х-6) (х+1)=12

Answer 1

х2-3х-2х+6-х2-х+6х+6=12-х

Answer 2

$x^{2} -3x-2x+6-( x^{2} +1-6x+6)=12  x^{2} -3x -2x +6- x^{2} -1+6x-6=12 x=12$