Question

|x-7|=2x+3

giải nhanh giúp mik nhé mik đang cần gấp lắm

Answer 1

\(\left|x-7\right|=2x+3\)

\(x-7=2x+3\)

\(x-2x=3+7\)

\(-x=10\)

\(x=-10\)

Answer 2

\(\left|x-7\right|=2x+3\)

\(\Leftrightarrow x-7=2x+3\)

\(\Leftrightarrow-x-7=3\)

\(\Leftrightarrow-x=10\)

\(\Leftrightarrow x=-10\)

 

\(\left|x-7\right|=2x+3\)

\(\Leftrightarrow\)\(\left|x-7\right|=-\left(2x+3\right)\)

\(\Leftrightarrow\)\(\left|x-7\right|=-2x-3\)

\(\Leftrightarrow\)\(3x-7=-3\)

\(\Leftrightarrow\)\(3x=\left(-3\right)+7\)

 \(\Leftrightarrow\)\(3x=4\)

\(\Leftrightarrow\) \(x=\dfrac{4}{3}\)

Vậy \(x=\dfrac{4}{3}\)