(17·x - 5)/(15·x + 5) + (13·x - 1)/(6·x + 2) = (7·x - 3)/(3·x + 1) + 1
(17·x - 5)/(5·(3·x + 1)) + (13·x - 1)/(2·(3·x + 1)) = (7·x - 3)/(3·x + 1) + 1
Mit Hauptnenner "2·5·(3·x + 1)" multiplizieren
2·(17·x - 5) + 5·(13·x - 1) = 2·5·(7·x - 3) + 2·5·(3·x + 1)
34·x - 10 + 65·x - 5 = 70·x - 30 + 30·x + 10
- x = - 5
x = 5
Probe
(17·5 - 5)/(15·5 + 5) + (13·5 - 1)/(6·5 + 2) = (7·5 - 3)/(3·5 + 1) + 1
3 = 3
Looks perfect.