Solve for x, y, z
z=80Y-70
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y=10Y+7\times 10Y-70
Substitute 10Y for x in the equation y=x+7x-70.
y=-70+80Y
Solve y=10Y+7\times 10Y-70 for y.
z=-70+80Y
Substitute -70+80Y for y in the equation z=y.
x=10Y y=-70+80Y z=-70+80Y
The system is now solved.
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