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x-y=5 ----> x=5+y(pindah ruas - jadi +)
x+y=13
(5+y)+y=13 (x dimasukin)
5+y+y=13
5+2y=13
2y=13-5
2y=8
y=8/2
y=4
Jika y=4 maka : (kembali ke rumus awal )
x-y=5
x-(4)=5
x-4=5
x=5+4
x=9