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Solve for x, y, z
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z=x 2x-y=3 a=z
Reorder the equations.
a=x
Substitute x for z in the equation a=z.
y=2x-3 x=a
Solve the second equation for y and the third equation for x.
y=2a-3
Substitute a for x in the equation y=2x-3.
z=a
Substitute a for x in the equation z=x.
x=a y=2a-3 z=a
The system is now solved.