Modulus (x) = 10
Modulus means we just take size of x neglecting the positive or negative sign.
But this how you solve modulus equation.
x = 10 This is the first part, which is the positive part.
Also for the negative part:
-x = 10 Divide both sides by -1.
x = -10
So the solutions are 10 and -10. (D)
