решите уравнение х(х-2)-(х+1)(х+3)=4

х(х-2)-(х+1)(х+3)=4x^2-2x-(x^2+3x+x+3)=4x^2-2x-(x^2+4x+3)=4x^2-2x-x^2-4x-3=4-6x-3=4-6x=4+3-6x=7x=-7/6 (x=-1*1/6)