Subtract the following . i)-11/26 from -17/39 , ii)-9/13 from 0 ,iii)-5 from -3/8 , iv ) -11/13 from 1
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Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it’s also called smog. Some air pollutants are poisonous.
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