Solve for θ
\theta =\frac{1-x}{3}
Solve for x
x=1-3\theta
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3\theta =1-x
Subtract x from both sides.
\frac{3\theta }{3}=\frac{1-x}{3}
Divide both sides by 3.
\theta =\frac{1-x}{3}
Dividing by 3 undoes the multiplication by 3.
x=1-3\theta
Subtract 3\theta from both sides.
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