Solve for x, y, z
x=\frac{a-5}{25}
y=-1
z=a
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x=\frac{1}{25}z-\frac{1}{5} z=a
Solve the second equation for x and the third equation for z.
x=\frac{1}{25}a-\frac{1}{5}
Substitute a for z in the equation x=\frac{1}{25}z-\frac{1}{5}.
x=\frac{1}{25}a-\frac{1}{5} y=-1 z=a
The system is now solved.
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