Ta có: 12x - 3x + 1 = 937

       = 12x - 3x = 937 - 1

       = 12x - 3x = 936

       = x.(12 - 3) = 936

       = x.9 = 936

       = x = 936 : 9

       = x = 104

<=>9x+1=937x

<=>937x-9x=1

<=>928x=1

<=>x=1/928

trời lạnh quá , ko nghĩ ra được

\(12x-3x+1=937\)

\(\Rightarrow9x+1=937\)

\(\Rightarrow9x=937-1\)

\(\Rightarrow9x=936\)

\(\Rightarrow x=936\div9\)

\(\Rightarrow x=104\)

12x - 3x + 1 = 937

9x = 936

x = 104

12x-3x+1=937

=>9x=936

=>x=104

=> 12x - 3x = 937 - 1

=> 12x - 3x = 936

=> 9x = 936

=> x=936:9

=> x = 104

12x - 3x = 937 - 1 

<=> 12x-3x=936

<=> 9x = 936

<=> x = 104

12x -3x +1 = 937

(12-3).x +1 = 937

9x +1 = 937

9x = 937-1

9x = 936

x = 936 : 9

x = 104

=> x = 104 

12x - 3 x 1 = 937

12x - 3 = 937

12x = 937 + 3

12x = 940

x = 940 : 12

x = ....