Solve for x_3
x_{3}=-13
Solve for x_2
x_{2}\in \mathrm{R}
x_{3}=-13
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0-3x_{3}=39
Anything times zero gives zero.
-3x_{3}=39
Anything plus zero gives itself.
x_{3}=\frac{39}{-3}
Divide both sides by -3.
x_{3}=-13
Divide 39 by -3 to get -13.
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