Question

2x (x-4)-(x+6)(x+7)=718+x(x-8)

Answer 1

2x^2-8x-(x^2+6x+7x+42=718+x^2-8x;

2x^2-8x-x^2-6x-7x-42-718-x^2+8x=0;

-13x-760=0;

-13x=760;

x=-58.4615384615;

вроді так