=>7/-(1+2x)=5/2x-3
=>7/2x-1=5/2x-3
=>7.(2x-3)=5.(2x-1)
=>14x-21=10x-5
=>10x-(14x-21)=5
=>10x-14x+21=5
=>10x-14x=5-21
=>(-4)x=-16
=>x=4
" . "là nhân ,còn " / "là phân số
\(\dfrac{-7}{1+2x}\) = \(\dfrac{5}{2x-3}\)
-7.(2\(x\) - 3) = 5.(1 + 2\(x\))
-14\(x\) + 21 = 5 + 10\(x\)
10\(x\) + 14\(x\) = 21 - 5
24\(x\) = 16
\(x\) = 16 : 24
\(x\) = \(\dfrac{2}{3}\)