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5/2-x=1/3
15/6-x=2/6
x=13/6
From step 1 to step 2, you must find the common denominator to be able to simplify the problem. That is why you multiplied by 3/3 for 5/2 and 2/2 for 1/3. From step 2 to step 3, you simply solve for x.