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i need explanation

rational expression is a ratio of two polynomials. To add or subtract two rational expressions with the same denominator, we simply add or subtract the numerators and write the result over the common denominator. When the denominators are not the same, we must manipulate them so that they become the same.

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.