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p + l = 26/2
p + l = 13
2(x+1) + (x-1) = 13
2x + 2 + x - 1 = 13
3x + 1 = 13
3x = 13-1
3x = 12
x = 4
p=2(x+1)
l=(x-1)
2(p+l)=26
2(2x+1+x-1)=26
2(3x-2)=26
3x-2=26/2
3x-2=13
3x=13+2
3x=15
x=15/3=5
x=5
maaf kalau salah
jadikan yang terbaik yaaaaa