Al+ H2SO4 ------Al2(SO4)3+SO2+H2O

2Al + 6 H2SO→Al2(SO4)3 + 3SO2 + 6H2O.
This equation is been balanced by following the sequence of balncing the metal first and then nonmetal, Oxygen and lastly hydrogen in steps.
And keeping in mind that the previous step balnaced after we have balnced the next one.if not, then return to the previous step. 

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