(x-6)/2 = x+13
x-6 = 2x + 26
x = -6-26 = -32
ONE SOLUTION.
2+6x-7 = 8+2x-10+4x
-5 + 6x = -2 + 6x
-5 = -2
This is not possible for any value of x ,
so NO SOLUTION
3x+5 = 1/5 (15x+10)
3x+5 = 3x+ 2
5 = 2
This is not possible for any value of x ,
so NO SOLUTION
1/4 (16+8x)= 3x-1-x+5
4 +2x = 2x +4
this is true for all values of x,
so, INFINITE SOLUTIONS.