what is -5/8x=56 by undoing

Answer 1

If the former:

-5x = 56*8 <--- opposite of divide is multiply

x = 56*8/ -5 <--- opposite of multiply is divide

x=-89.6

If the latter:

-5 = 56*8x

-5/(56*8) = x

x=-0.017857142

See the difference?