4z = 4
z = 1
y - 5z = -2
y - 5(1) = -2
y - 5 = -2
y = -2 + 5
y = 3
x + 2y - z = 7
x + 2(3) - 1 = 7
x + 6 - 1 = 7
x = 7 - 6 + 1
x = 2
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4z = 4
z = 1
y - 5z = -2
y - 5(1) = -2
y - 5 = -2
y = -2 + 5
y = 3
x + 2y - z = 7
x + 2(3) - 1 = 7
x + 6 - 1 = 7
x = 7 - 6 + 1
x = 2