How to do two step equations with fractions

Question

I need help to sovle a -5a over 2 = 75

Answer 1

a - (5/2)a = 75

 

Combine like terms {a = (2/2)a; (2/2)a - (5/2)a = -(3/2)a}

 

-(3/2)a = 75

 

Multiply both sides by -2/3:

 

a = 75*(-2/3)

 

Can you finish it from here?