Solve for n
n=\frac{a_{n}-4}{3}
Solve for a_n
a_{n}=3n+4
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3n=a_{n}-4
Subtract 4 from both sides.
\frac{3n}{3}=\frac{a_{n}-4}{3}
Divide both sides by 3.
n=\frac{a_{n}-4}{3}
Dividing by 3 undoes the multiplication by 3.
a_{n}=3n+4
Swap sides so that all variable terms are on the left hand side.
Examples
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Matrix
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Simultaneous equation
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Limits
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