maths
posted by blabla .
1) 2aa/5 = 2/3
2) 3(a+4)+1=a/2
3) 4x1/3+2(x+6)=1,1/2
4) 2/x3/4X=2
5) 3n5n=14
6)3/x+2/x+2=1
7) 2/n+2+3/n1=5
8) 2/a+13/2a+3

I imagine you're supposed to solve for the missing variables. I'll do a couple so you get the idea.
1)
2a  a/5 = 2/3
adding like terms:
1.8 a = 2/3
9/5 a = 2/3
a = 10/27
2)
3(a+4)+1 = a/2
3*a + 12 + 1 = a/2
3*a + 13 = a/2
13 = 2.5a
a = 13/2.5
. . .