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l = x + 1
Keliling = 92 cm
K = 2(p+l) = 92
2(2x+3+x+1)
2(3x+4)
6x + 8 = 92
6x = 92 - 8
6x = 84
x = 84 : 6
x = 14
panjang = 2x + 3
= 2(14) + 3
= 28 + 3
= 31 cm