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Pada barus kedua,
5, 3+x, x+1
Pada baris ketiga,
8+x, 4+2x
Pada baris keempat(terakhir)
(8+x )+(4+2x) = 2x
12 + 3x = 2x
3x - 2x = -12
x = -12
Selamat belajar!
@wello1
thanks