please balance eqn d.
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2mg+o2=2mgo
3caco3+2H3po4=ca3(po4)2+3h2o+3co2
n2+3h2=2nh3
3caco3+2H3po4=ca3(po4)2+3h2o+3co2
n2+3h2=2nh3
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