Question

x + 45 = 51

what does "x" equal?

EXPLAIN

Answer 1

Hey there!

6 + 45 = 51

so x = 6

Hope this helps!
Have a great day (:

Answer 2

We are given the equation x + 45 = 51 and are told to solve for x, meaning that we want to isolate x. 
x + 45 = 51
    -45    -45
x = 6
Hope this helps!