Kein Problem.
Alternative:
m = ( ( L - T2 ) : ( F - T2 ) ) - ( ( L - T1 ) : ( F - T1 ) ) | * Hauptnenner
m (F-T2)(F-T1) = (L-T2)(F-T1) - (L - T1)(F - T2)
m (F-T2)(F-T1) = L(F-T1) - T2(F-T1) - L (F - T2) + T1(F-T2)
m (F-T2)(F-T1) + T2(F-T1) - T1(F-T2) = L(F-T1) - L (F - T2)
m (F-T2)(F-T1) + T2(F-T1) - T1(F-T2) = L(F-T1 - F + T2)
m (F-T2)(F-T1) + T2(F-T1) - T1(F-T2) = L(T2-T1)
(m (F-T2)(F-T1) + T2(F-T1) - T1(F-T2)) / (T2 - T1) = L
(m (F-T2)(F-T1) + T2F-T2T1 - T1F + T1T2)) / (T2 - T1) = L
(m (F-T2)(F-T1) + T2F - T1F )) / (T2 - T1) = L
(m (F-T2)(F-T1) + (T2 - T1)F )) / (T2 - T1) = L
(m (F-T2)(F-T1)/(T2-T1) + F = L | Vorzeichen drehen (oben und unten) freiwillig
- (m (F-T2)(F-T1)/(T1-T2) + F = L entspricht der Vorgabe