x=-6/15. See Pitch Perfect Cup Song played by a pencil:
https://www.youtube.com/watch?v=18ch5...

See Havana by Camila Cabello played by a pencil:
https://www.youtube.com/watch?v=UaPuN...

-14x - 17 = -14 + x + 4 -1
-14x - x = -14 + 4 - 1 + 17
-15x = 6
x = -6/15