The temperature of a chemical solution is originally 21^\circ\text{C}21 ∘
C21, degrees, start text, C, end text. A chemist heats the solution at a constant rate, and the temperature of the solution is 75^\circ\text{C}75
∘
C75, degrees, start text, C, end text after 121212 minutes of heating.
The temperature, TTT, of the solution in ^\circ\text{C}
∘
Cdegrees, start text, C, end text is a function of xxx, the heating time in minutes.
Write the function's formula.
T=T=T, equals

T=