Solve for Δ_30
\Delta _{30}=\frac{z}{2}
Solve for z
z=2\Delta _{30}
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2\Delta _{30}=z
Swap sides so that all variable terms are on the left hand side.
\frac{2\Delta _{30}}{2}=\frac{z}{2}
Divide both sides by 2.
\Delta _{30}=\frac{z}{2}
Dividing by 2 undoes the multiplication by 2.
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