Question

x-1=x-3

x+1=3x+7

2-x=x

2x-1=3x-10

Answer 1

x-1=x-3

<=>x-x=1-3

<=> 0x= -2 ( không có giá trị của x TM)

 x+1=3x+7

<=> x-3x= -1+7

<=> -2x =6

<=> x= -3

2x-1=3x-10

<=> 2x-3x=1-10

<=> -x=-9

<=> x=9

Answer 2

\(x-1=x-3\)

\(x+x=-3+1\)

     \(x.2=-2\)

         \(x=-2:2\)

         \(x=-1\)

Answer 3

x-1=x-3

<=> x-x =-3 +1

<=>=0x=-2 (Vô nghiệm)

x+1=3x+7

<=> x-3x =7-1

<=> -2x =6

=>x=-3

2-x=x

<=> 2=x+x

<=>2=2x

<=>x=1

2x-1=3x-10

<=> 2x-3x = -10 +1

<=>-x =-9

<=> x=9