solve (1/7 + 5/4) (11/28 - 1/7)

solve (1/7 + 5/4) (11/28 - 1/7)

I had this question on a test.  I know that the correct answer is 39/112, but no matter what I do I can't figure out HOW that is the correct answer.  Please assist?  I really want to know what I am doing wrong!
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1 Answer

(1/7 + 5/4) (11/28 - 1/7)

(4/28 + 35/28) (11/28 - 4/28)

(39/28) (7/28)

=273/784 in lowest term 39/112

by Level 3 User (2.5k points)

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