\(\dfrac{x-1}{x+5}=\dfrac{6}{7}\)
\(\Leftrightarrow7x-7=6x+30\)
hay x=37
https://hoc24.vn/cau-hoi/x-1-x5-6-7.2213164730326
\(\dfrac{x-1}{x+5}=\dfrac{6}{7}\)
\(\Leftrightarrow6\left(x+5\right)=7\left(x-1\right)\)
\(\Leftrightarrow6x+30=7x-7\)
\(\Leftrightarrow30+7=7x-6x\)
\(\Leftrightarrow x=37\)
\(\dfrac{x-1}{x+5}=\dfrac{6}{7}\)
đk: x < -5
\(\Rightarrow\left(x+5\right).6=\left(x-1\right).7\)
\(\Rightarrow6x+30=7x-7\)
\(\Rightarrow6x-7x=-7-30\)
\(\Rightarrow-x=-37\)
\(\Rightarrow x=37\)
( thỏa mãn)
