Harry Potter theme song played by a pencil + math equation
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x=-6/15. See Pitch Perfect Cup Song played by a pencil:
See Havana by Camila Cabello played by a pencil:
-14x - 17 = -14 + x + 4 -1
-14x - x = -14 + 4 - 1 + 17
-15x = 6
x = -6/15