Solve for x, y, z
x=a+12
y=12
z=a
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z=x-12
Substitute 12 for y in the equation z=x-y.
x=z+12 z=a
Solve the second equation for x and the third equation for z.
x=a+12
Substitute a for z in the equation x=z+12.
x=a+12 y=12 z=a
The system is now solved.
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