\(\left(x-5\right).\frac{30}{100}=\frac{20x}{100}+5\)
\(\Leftrightarrow\left(x-5\right).0,3=0,2.x+5\)
\(\Leftrightarrow0,3.x-1,5=0,2.x+5\)
\(\Leftrightarrow0,3.x-0,2.x=5+1,5\)
\(\Leftrightarrow0,1.x=6,5\)
\(\Leftrightarrow x=65\)
\(\frac{\left(x-5\right).30}{100}=\frac{20x}{100}+\frac{500}{100}\)
\(\frac{30x-150}{100}=\frac{20x+500}{100}\)
=> 30x - 150 = 20x + 500
30x - 20x = 500 + 150
10x = 650
x = 65