Question

tìm x biết 

72-x/x-18==3/5

Answer 1

\(\Leftrightarrow5\left(72-x\right)=3\left(x-18\right)\\ \Leftrightarrow360-5x=3x-54\\ \Leftrightarrow360-5x-3x+54=0\\ \Leftrightarrow414-8x=0\\ \Leftrightarrow x=\dfrac{207}{4}\)