∴ξ∵ξ∴steam...part2154∵ξ∴ξ∵【STEEPスレ【

[0777 Anonymous 2018/02/19(月) 16:09:03.28]

縄の長さ
x/3-1=x/4+1.5
4x-12=3x+18
x=30

30/3-1=9
9m