Solve for x, y, z, a
a=73
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z=5\times 9+4\times 7
Consider the third equation. Insert the known values of variables into the equation.
z=45+28
Do the multiplications.
z=73
Add 45 and 28 to get 73.
a=73
Consider the fourth equation. Insert the known values of variables into the equation.
x=7 y=9 z=73 a=73
The system is now solved.
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