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(biloks pb) + (biloks s) + (biloks O×4) = 0
biloks pb + 4 + (-2x4) = 0
biloks pb + 4 + (-8) = 0
biloks pb + (-4) = 0
biloks pb = +4
(bilok pb) +( bilok so4) = 0
bilok pb + (-2) = 0
bilok pb = +2
bilok so4 = (-2), karena ion so4 adalah -2