5000+15X=4500+18.75X
(18.75-15)x=5000-4500
3.75x=500
x=500÷3.75
x=400/3
5000 + 15X = 4500 + 18.75X
5000 + 15X - 4500 - 15X = 4500 + 18.75X - 4500 - 15X
500 = 3.75X
500 ÷ 3.75 = 3.75X ÷ 3.75
500 ÷ 3.75 = X
X = 133.3 ( 133 1/3)