8u=3u+35

so we shall do this like

8u=3u+35           (so we will bring like values on one side)

8u-3u=35             (and now simply subtract)

5u = 35                             ( now we will birng 5 to the other side and then divide by 35 which then gives us u)

u = 35/5             (now simply divide)

u = 7   ANSWER

i hope u've understood by now but if not then pls be free to ask!

hope it helps!

The answer is 7