Question

\(x-15=6+4x\)

giúp mk với,please!!!!

Answer 1

#)Giải :

\(x-15=6+4x\)

\(\Leftrightarrow x-15-6+4x=0\)

\(\Leftrightarrow\hept{\begin{cases}x-15=0\\6+4x=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=15\\x=\frac{3}{2}\end{cases}}}\)

Vậy \(x=15;x=\frac{3}{2}\)

Answer 2

\(x-15=6+4x\)

\(\Leftrightarrow x-15=4x+6\)

\(\Leftrightarrow x-15+4x=6\)

\(\Leftrightarrow x-4x-15=6\)

\(\Leftrightarrow-3x=21\Leftrightarrow x=-7\)

Answer 3

x - 15 = 6 + 4x

x - 15 + 4x = 6

x - 4x - 15 = 6

x - 4x = 6 + 15

-3x = 21

 x = 21 : (-3)

 x = 7