Question 984699
I will assume it is 5/(2a) and not (5/2)a
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Common denominator is 30a
75-105a-48a=328a
75=481a
a=(75/481)
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check with  numerical solution of 0.155925 for a.
(5/(2a)-3.5-1.6=10.933
16.033-5.1=10.933, checks