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7,200 ÷ y = 90 equalsy = 80.First,multiply both sides by y. / Your problem should look like: 7200 = 90y.Second,divide both sides by 90. / Your problem should look like:= y.Third,simplifyto 80. / Your problem should look like: 80 = y.Fourth,switch sides. / Your problem should look like: y = 80, which is the answer....