Solve for x, y, z
x=a
y=\frac{7-7a}{2}
z=a
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y=3.5-3.5x
Calculate y from y=3.5\left(1-x\right).
x=z z=a
Solve the second equation for x and the third equation for z.
x=a
Substitute a for z in the equation x=z.
y=3.5-3.5a
Substitute a for x in the equation y=3.5-3.5x.
x=a y=3.5-3.5a z=a
The system is now solved.
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