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8x = 104
x = 13
nah udah ketemu x nya tinggal dimasukin aja.
144 = 2 ( 3x+10+x+10)
144/2 = 4x + 20
72 = 4x + 20
72 - 20 = 4x
52 = 4x
x = 52/4
x = 13
maka
p = 3x + 10
= 3(13) + 10
= 49
l = x + 10
= 13 + 10
= 23