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6x +1 = 31
6x = 31-1
6x = 30
x = 30/6
x = 5 cm
(x+7) = 12cm >> Ini terpanjang
(2x-1) = 9cm
(3x-5) = 10cm
31 = x+7 + 2x-1 + 3x-5
31 = 6x + 1
30 = 6x
x = 5
sisi terpanjang = x+7 = 5+7 = 12