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x - y = 40 atau x = 40 + y
x + y =100 dan x -y = 40 adalah dua linear
x +y = 100 menjadi 40+y +y =100 ..> 2y =60
dari dua linear tsb dapat dijadikan satu variabel .
2. 4x - 6 = 54
4x = 60
x = 15
x+30 = 70
2. 54 + 6 =60:4 = 15