can not derive the equation of V ut and V lt VPULL-UP VOUT R2 VOH Vc RPULL-UP

can not derive the equation of V ut   and V lt

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VPULL-UP VOUT R2 VOH Vc RPULL-UP VTL VT VTH VIN R1 10 VIN 4 V+ 2 VOL V- 18 9 NONINVERTING HYSTERESIS: VTH = ((R1 + R2)*VREF- (R1*VOL))/R2 VTL = ((R1 + R2)*VREF- (R1*VOH))/R2 HYST = V TH -V TL HYST = R1*(VOH -VOL)/R2 %3D VREF VEE %3D VPULL-UP VOUT R2 VOH Vc RPULL-UP VTL VT VTH VIN R1 10 VIN 4 V+ 2 VOL V- 18 9 NONINVERTING HYSTERESIS: VTH = ((R1 + R2)*VREF- (R1*VOL))/R2 VTL = ((R1 + R2)*VREF- (R1*VOH))/R2 HYST = V TH -V TL HYST = R1*(VOH -VOL)/R2 %3D VREF VEE %3D