So 50/200=0.25
therefore, x has to be divided by 10 and be equal to that number, so 2.5/10=0.25 but let's do it with steps
1) Simplify or combine like terms (in this case we need to simplify 50/200 which is 0.25)
2) To isolate x, do the opposite operation on BOTH SIDES.
x/10 ×10 cancels out the 10
x=0.25×10
x=2.5