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2x+(2x+2)+(3x+1)=24
2x+2x+3x=24-2-1
7x=21
x=3
panjang sisi terpanjang (3x+1)
=(3.3+1)cm
=10 cm
7x+3=24
7x=21
x=3
2x=2.3=6
(2x+2)= 2.3+1=6+2=8
(3x+1)=3.3+1=9+1=10
jadi sisi terpanjang 3x+1