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90= 2* (30+l)
30+l = 90:2
30+l = 45
l = 45-30
l = 15
90 - 60 = 30
30 ÷ 2 = 15
Jadi lebar halaman rumah yaitu 15 meter.
#maaf klo ada yg salah
#semoga ini membantu anda