(x-10)^x²-9=(x-10)^3-x

X²- 9 = 3 – x
x²- 9 – 3 + x = 0
x² + x – 12 = 0
(x + 4)(x – 1) =0

x + 4 = 0
x = -4

Atau

x – 1 = 0
x =1