10=vl+vr 6=vl−vr vr=10−vl vr=6+vl 10−vl=6+vl 2vl=4 vl=210=vl+vr 6=vl−vr vr=10−vl vr=6+vl 10−vl=6+vl 2vl=4 vl=2