Tolong pake cara yaa (spltv)

Uang adinda = x
Uang binary = y
Uang cindy = z
x = 40000 + y + 2z
x - y - 2z = 40000
x + y + z = 200000
y - z = 10000
Jadi model matematikanya
x - y - 2z = 40000...... (1)
x + y + z = 200000........(2)
y - z = 10000..................(3)

Eliminasi (1)dan (2)
x - y - 2z = 40000
x + y + z = 200000 -
- 2y - 3z = - 160000 |×1| - 2y - 3z = - 160000
y - z = 10000 |×2| 2y - 2z = 10000 +
- 5z = - 150000
z = 30000
y - z = 10000
y - 30000 = 10000
y = 10000 + 30000
y = 40000
x + y + z = 200000
x + 40000 + 30000 = 200000
x + 70000 = 200000
x = 200000 - 70000
x = 130000
Jadi 2x + y - z = 2.130000 + 40000 - 30000 =
260000 + 10000 = 270000