Question 752794
1)
-7x =x
-7x-x =o
-8x=o
x= 0/8
x=o it has solution
2)
x/(x-4) = 4/(x-4)
by cross multiplication 
x(x-4)=4(x-4)
x^2-4x=4x-16
x^2-8x+16=0
(x-4) (x-4) =0
(x-4)=0
x=4
yes your solution correct