First balance Hg
So,
3Hg(OH)2 + H3Po4 = Hg3(Po4)2 + HOH
Now, balancing O
3Hg(OH)2 + H3Po4 = Hg3(Po4)2 + 6HOH
Oh my god, got stucked.
Never mind Use Chemical Equation Balancer
It will help you
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