Hi guys, i have a problem while balancing this equation idk if it is an ill possed problem, i tried to solve it too many times and i can't get an answer, this equation was assigned by my teacher and need to be solved by redox method.

PH3 + KMnO4 + H2SO4 → K2SO4 + MnSO4 + H3PO4

Trying to solve it, i got this

5PH3+8KMnO4+H2SO4→ K2SO4+8KMnO4+5H3PO4.

I felt so confused with this, pls help me guys