Solve for x, y, z
x=\frac{a-2}{2}
y=3
z=a
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y=3
Calculate y from y=2+1.
x=\frac{1}{2}z-1 z=a
Solve the second equation for x and the third equation for z.
x=\frac{1}{2}a-1
Substitute a for z in the equation x=\frac{1}{2}z-1.
x=\frac{1}{2}a-1 y=3 z=a
The system is now solved.
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