@Kitonum  Thank you so much for your kind reply.

I'll keep in touch with you if I face any problem 

Thanx again.

This_are_equations.docx

Initially tried same as you, but problem is that L is constant (known) & not unknown that's why answers are not matching.  " This_are_equations.docx "

I have attached a link where you'll find the set of equation (same as I stated earlier) with answers.

Please help me to get those. 

Thanx for the reply.