Simplify \(\frac{6}{1.5}\) to \(4\).
\[4=\frac{5.5}{R-x}\]
Multiply both sides by \(R-x\).
\[4(R-x)=5.5\]
Divide both sides by \(4\).
\[R-x=\frac{5.5}{4}\]
Simplify \(\frac{5.5}{4}\) to \(1.375\).
\[R-x=1.375\]
Subtract \(R\) from both sides.
\[-x=1.375-R\]
Multiply both sides by \(-1\).
\[x=-1.375+R\]
Regroup terms.
\[x=R-1.375\]
x=R-1.375
