解:解方程,此方程的解为x = 40
20 ×(x + 5)= 22.5X
20x + 100 = [(22×10+5)/10]x
20x + 100 = (225/10)x
20x + 100 = (45/2)x
(40/2)x + 100 = (45/2)x
(45/2)x - (40/2)x = 100
(5/2)x = 100
x = 100 ÷ 5/2
x = 100 × 2/5
∴x = 40
答:此方程的解为x = 40