\(\frac{7+x}{8}=\frac{x-10}{3}\)
\(\Leftrightarrow3\left(7+x\right)=8\left(x-10\right)\)
\(\Leftrightarrow21+3x=8x-80\)
\(\Leftrightarrow3x-8x=-80-21\)
\(\Leftrightarrow-5x=-101\)
\(\Leftrightarrow x=\frac{101}{5}\)
\(\Rightarrow3\left(7+x\right)=8\left(x-10\right)\)
\(\Rightarrow21+3x=8x-80\)
\(\Rightarrow5x=101\)
\(\Rightarrow x=\frac{101}{5}\)
\(\frac{7+x}{8}=\frac{x-10}{3}\)
\(\Rightarrow3\left(7+x\right)=8\left(x-10\right)\)
\(21+3x=8x-80\)
\(3x-8x=-80-21\)
\(-5x=-101\)
\(\Rightarrow x=20.2\)
Vậy \(x=20.2\)
