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3x+3=21-3
3x=18
x=18÷3=6
x=6
Keliling = 21 cm
Keliling Segitiga = 3 x Sisi
K = 3 x (x+1)
21 = 3x + 3
3x = 21 - 3
3x = 18
x = 6
Adapun panjang sisinya = 6 + 1 = 7