Question

Which equation does not belong with the other three?. x+3=-1 x+1=-5 x-2=-6 x-9=-13

Answer 1

X+3=-1 => x=-4
x+1=-5 => x=-6
x-2=-6  => x=-4
x-9=-13 => x=-4
So the different one is x+1=-5. Have a nice day!! ^^

Answer 2

X+3 = -1
  -3    -3
x     = -4

x+1 = -5
   -1   -1
x    = -6

x-2 = -6
  +2   +2
x    = -4

x-9 = -13
  +9   +9
x    =  -4