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a x 2 + 27 = 53
2a = 53-27
2a = 26
a = 26/2
a = 13
no 5)
a) keliling = p + (p+1) + (p-2)
= 3p - 1
b) 23 = 3p - 1
3p = 24
p = 8
c) panjang sisi" segitiga adalah 8 , 9 dan 6