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20 = 6x+2
18 = 6x
x = 3cm
6x + 2 = 20
6x = 18
x = 3
Pembuktian
2x = 2 (3)
= 6 cm
3x - 2 = 3(3) - 2
= 7 cm
x+4= 3+4
= 7 cm
Keliling = 6 + 7 +7 = 20 cm