Answer:
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Hello.
The answer is: 3.3333
To get the answer add 2,5 and 3 that is 10 then divide by 3 to get 3.3
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Tectonic plate shifting...
First lets do Rb..we have 1 one the left and 3 on the right. so 3RbOH will balance that
PO4 is equal on both side
since we put 3 for RbOH now we have 3 O on the left
so we put 3 for H2O
now we have 6 H on each side so everything is balanced