Jawabanmu

2014-05-18T17:06:47+07:00
180' = 2x' + x' + 4' + 4x' + 35'
        = 7x' + 39'
7x' = 180' - 39'
     = 141'
x' = 141/7
x' = 20.143' ≈ 20'
x' = 20,143' dan kalau pembulatan x ≈ 20'