x+y+z = 13 dan 2y = 3y = 4z. Nilai x+y-z adalah

x + y + z = 13 ................ x 12
12x + 12y + 12z = 156
2x = 3y = 4z ................. x 6
12x = 18y = 24z
18y + 12y + 12z = 156
2x = 3y = 4z ................. x 3
6x = 9y = 12z
18y + 12y + 9y = 156
39y = 156
y = 4
18y + 12y + 12z = 156
30x4 + 12z = 156
12z = 36
z = 3
x + 4 + 3 = 13
x = 6

Mari cek kalau betul nilainya :
2x = 3y = 4z
2x6 = 3x4 = 4x3 = 12.

Nilai x + y - z = 6 + 4 - 3 = 7

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