Question

Tìm x;

(15-x)+(x-12)=7-(-5+x)

 

Answer 1

(15-x)+(x-12)=7-(-5+x)

<=> 15-x+x-12= 7 +5 -x

<=> 15-12-7-5= -x +x -x

<=> -9=  -x

<=>x= 9

Answer 2

(15 - x) + (x - 12) = 7 - (-5 + x)

     15 - x + x - 12 = 7 + 5 - x

                 3 - 2x = 12 - x

                    2x - x = 12 - 3

                          x = 9

Vậy x = 9

Answer 3

(15-x)+(x-12)=7-(-5+x)

15-x+x-12=7+5-x

3-2x=12-x

2x-x=12-3

x=9

Vậy x=9