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(4+a)/a = 6,3/1,8
1,8(4+a) = 6,3a
7,2 + 1,8a = 6,3a
(6,3-1,8)a = 7,2
4,5a = 7,2
a = 7,2/4,5 = 8/5 = 1,6 m
p = 4 + 1,6
tinggi pohon = 5,6 m