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MSP430F5329: Temperature Sensor Calibration

Part Number: MSP430F5329

I am looking at 1.13.5.3 in SLAU208P 

it says 

Vsense = TCsensor * Temp + Vsensor (eqn 8)

So solving for Temp

Temp = (Vsense - Vsensor) / TCsensor

so if 

Vsense = ADC(raw)

Vsensor = CAL_ADC_T30

TCsensor = (CAL_ADC_T85 - CAL_ADC_T30) / (85 - 30)

1 / TCsensor =  (85 - 30) / (CAL_ADC_T85 - CAL_ADC_T30)

The documentation says in EQn 9:

Temp = (ADC(raw) - CAL_ADC_T30) * ((85 - 30) / (CAL_ADC_T85 - CAL_ADC_T30) +30 

What is the +30 in Eqn 9 and Eqn 11?


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