Solve for x
x=4\left(L-2100\right)
Solve for L
L=\frac{x}{4}+2100
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0.25x+2100=L
Swap sides so that all variable terms are on the left hand side.
0.25x=L-2100
Subtract 2100 from both sides.
\frac{0.25x}{0.25}=\frac{L-2100}{0.25}
Multiply both sides by 4.
x=\frac{L-2100}{0.25}
Dividing by 0.25 undoes the multiplication by 0.25.
x=4L-8400
Divide L-2100 by 0.25 by multiplying L-2100 by the reciprocal of 0.25.
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