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O=-2x2=-4
Pb+(-4)=0
Pb=+4
PbO
O=-2
Pb+(-2)=0
Pb=+2
Maka jawabannya C
Caranya, dalam senyawa PbO2 biloksnya -> x - 4 = 0
x = +4
Sedangkan PbO -> x - 2 = 0
x = +2