90/X-90/3X=3
270/3X-90/3X=3
160/3X=3
180=9X
X=20请再帮帮忙吧：解方程2.4 ∕ 5X -2.4 ∕6X﹦1.62.4 ∕ 5X -2.4 ∕ 6X﹦1.614.4/X-12/X=482.4/X=48X=1/20