Simplify \(\frac{5+x}{20}\times 10\) to \(\frac{5+x}{2}\).
\[28.5=20+30-\frac{5+x}{2}\]
Simplify \(20+30-\frac{5+x}{2}\) to \(50-\frac{5+x}{2}\).
\[28.5=50-\frac{5+x}{2}\]
Subtract \(50\) from both sides.
\[28.5-50=-\frac{5+x}{2}\]
Simplify \(28.5-50\) to \(-21.5\).
\[-21.5=-\frac{5+x}{2}\]
Multiply both sides by \(2\).
\[-21.5\times 2=-5-x\]
Simplify \(-21.5\times 2\) to \(-43\).
\[-43=-5-x\]
Add \(5\) to both sides.
\[-43+5=-x\]
Simplify \(-43+5\) to \(-38\).
\[-38=-x\]
Multiply both sides by \(-1\).
\[38=x\]
Switch sides.
\[x=38\]
x=38
