I do not know what to do when they tell me to Write a balanced equation, then they give me thisAg2SO4 + AlCl3 > -----------------when when you have to complete the equation, and then balance it

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This is a double reaction, where you have 4 different elements in play. What you want to do is break them all up, and pair them with the opposite element they were with before ! Then make sure both sides have the same amount of each element of each side.