Respuesta :

7 = a/2 + 4

first subtract 4 from both sides

7 (-4) = a/2 +4 (-4)
3 = a/2

Then isolate a by multiplying 2 to both sides

3(2) = a/2 x 2
6 = a

a = 6

hope this helps
7=a/2+4
7x2=14
14=a-4
+4
18=a