Let supose:
X + X + X = 60 à Equation (1)
X + Y + Y = 30 à Equation (2)
Y - 2z = 3 à Equation (3)
By equation 1
We knowX + X + X = 3X)
3X = 60
X = 60/3
X = 20
By equation 2
X + Y + Y = 30
X + 2Y = 30 à Equation (4)
Put the value of X in equation (4)
20 + 2Y = 30
2Y = 30 – 20
2Y = 10
Y = 10/2
Y = 5
By equation 3
Y – 2z = 3
Know Y = 5
Good
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