I need an equation to solve this math problem

Algebra
Tutor: None Selected Time limit: 1 Day

Madison middle school one fifth of the eighth-grade students and three force of the seventh-grade students take computer classes there are 126 more seventh-grade students taking computer classes and there are eighth-grade students taking computer classes. Let x represent the total number of 8 graders students who attend Madison middle school and Y represent the total number of seventh-grade student to attend Madison middle school. I need an equation 

May 6th, 2015

1/5x eighth grade students

3/4y seven grade students

3/4y-28=1/5x.......................................................................................................

May 6th, 2015

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May 6th, 2015
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