giúp mình với !!! -x=2x+4 3-x=4 -2=x+1 x-6=2x

– x = 2x + 4

<=>- x – 2x = 4

<=>-3x = 4 

<=>x = $\frac{-4}{3}$ 

3 – x = 4

<=> x = r – 3

<=> x = 1

– 2 = x + 1

<=> x = -2 – 1

<=> x = – 3

x – 6 = 2x

<=> x – 2x = 6

<=> – x = 6

<=> x = – 6