Try the algebraic method without arranging any equations.
Start with chromium sulfate - you'll need 2 chromium atoms and 3 sulfate residues. Combine the hydrogen atoms of sulfuric acid with oxygen atoms to make water. How many oxygen atoms are left? If the number of the remaining oxygen atoms is even then combine them into molecules, if odd, multiply all the reactants by 2 and then combine the remaining oxygen atoms into molecules. And the chemical equation is balanced.