Mohon bantuannya kaka kaka

UW = UQ + QW
5 = UQ + 2
3 = UQ

QU = c
maka UQ = -c

QW = 2/3 QU
QW = -2/3 c

OW = OP + PQ + QW
       = a + b + (-2/3 c)
       = a + b - 2/3 c

jawab (C)