The absolute value gives the positive value of any given number inside the symbol. The absolute equation is,
2.5 = I d - 2I
The values of d can be calculated through,
2.5 = d - 2
d = 4.5
Also,
-2.5 = d - 2
-2.5 + 2 = d
d = -0.5
Thus, the maximum value of the temperature is 4.5 and the minimum value of the temperature is -0.5.