Solve for x_5
x_{5}=-5
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x_{5}-1=\frac{-18}{3}
Divide both sides by 3.
x_{5}-1=-6
Divide -18 by 3 to get -6.
x_{5}=-6+1
Add 1 to both sides.
x_{5}=-5
Add -6 and 1 to get -5.
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