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P2=U2*I
P1=3P2
U1*I=3*U2*I
-------------------------
U1=3*U2
U=U1+U2
-------------------------------
U=3*U2+U2
4*U2=U
U2=U/4
U2=12V/4=3V
U1=3*U2=3*3V=9V