What is the balanced reaction for these 2 chemical equations

What is the balanced reaction for these 2 chemical equations?

tin(II) nitrate + magnesium = ?

zinc + phosphoric acid = ?

Solution

3Zn+2H3PO4=Zn3(PO4)2+3H2

Mg+Sn(NO3)2=Mg(NO3)2+Sn