Solve for t
t=\frac{S_{1}-20}{4}
Solve for S_1
S_{1}=4\left(t+5\right)
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20+4t=S_{1}
Swap sides so that all variable terms are on the left hand side.
4t=S_{1}-20
Subtract 20 from both sides.
\frac{4t}{4}=\frac{S_{1}-20}{4}
Divide both sides by 4.
t=\frac{S_{1}-20}{4}
Dividing by 4 undoes the multiplication by 4.
t=\frac{S_{1}}{4}-5
Divide S_{1}-20 by 4.
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