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Verified answer
Panjang TR = x12 + x/9+11 = 9/12
12+x/20 = 9/12
12 (12+x) = 9 x 20
144+12x = 180
12x = 180 - 144
12 x = 36
x = 36 : 12
x = 3
maaf kalau salah.