Solve for x, y, z, a
a=7
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z=5\times 1+2
Consider the third equation. Insert the known values of variables into the equation.
z=5+2
Multiply 5 and 1 to get 5.
z=7
Add 5 and 2 to get 7.
a=7
Consider the fourth equation. Insert the known values of variables into the equation.
x=1 y=2 z=7 a=7
The system is now solved.
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