Question

l5x-3l-x=7

Answer 1

|5x-3| - x = 7

<=> |5x-3| = 7-x

<=>\(\left[\begin{array}{nghiempt}5x-3=7-x\\5x-3=-7+x\end{array}\right.\)

<=> \(\left[\begin{array}{nghiempt}6x=10\\4x=-4\end{array}\right.\)

<=> \(\left[\begin{array}{nghiempt}x=\frac{5}{3}\\x=-1\end{array}\right.\)

Answer 2

|5x-3|-x=7

=>5x-3=7+x

=>\(\left[\begin{array}{nghiempt}5x-3=\left(-7\right)+x\\5x-3=7+x\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}5x+x=\left(-7\right)+3\\5x-x=7+3\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}5x-x=\left(-4\right)\\5x-x=10\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}6x=\left(-4\right)\\4x=10\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}x=\left(-4\right):6\\x=10:4\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}x=\frac{-2}{3}\\x=\frac{5}{2}\end{array}\right.\)

Bỏ mấy dấu thẳng phía sau nhé