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30 = 3X+1 +3X + X+1
30 = 7X +2
30-2= 7x
28 = 7x
28/7= x
4 = x
alas: x+1
: 4+1 = 5
tinggi : 3x
: 3.4 = 12
Luas : alas. tinggi /2
5.12/2 = 30