Explanation:
you have to transform the equations, so that in the end you have only x on one side, and everything else on the other.
and that is the solution.
remember, when doing such transformations, we have to do every change to both sides at the same time.
a)
x/5 = 3 | multiply both sides by 5
x = 3×5 = 15
b)
x/2 = 8.5 | multiply both sides by 2
x = 8.5×2 = 17