\(\frac{2}{4-x}=\frac{-7}{x+1}\)
\(\Rightarrow2\left(x+1\right)=\left(-7\right)\left(4-x\right)\)
\(\Rightarrow2x+2=\left(-28\right)+7x\)
\(\Rightarrow2x-7x=\left(-28\right)-2\)
\(\Rightarrow\left(-5\right)x=\left(-30\right)\)
\(\Rightarrow x=6\)
Vậy \(x=6\)
=>2*(x+1)=-7*(4-x)
=>2x+2=-28+7x
=>5X=30=>x=6