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40+2x+4<50
2x<6
x<3
p=20
l=(x+2)
K=2(p+l)
Karena K=50 maka
2(p+l)=50
20+(x+2)=50/2
x+2=25-20
x=5-2
x=3
l=x+2
l=3+2
l=5
Jawaban : x=3