- 12 + ( x - 9 ) = 0
x - 9 = 0 - (- 12 )
x - 9 = 12
x = 12 + 9
x = 21
Vậy x = 21
Tham khảo nhé
- 12 + ( x - 9 ) = 0
x - 9 = 0 - ( - 12 )
x - 9 = 12
x = 12 + 9
x = 21
\(-12+\left(x-9\right)=0\)
\(-12+x-9=0\)
\(-21+x=0\)
\(x=21\)
-12+(x-9)=0
x-9=0-(-12)
\(\Rightarrow x-9=12\)
\(\Rightarrow x=12-9\)
\(\Rightarrow x=21\)
Vậy x=21
-12 + ( x - 9 ) = 0
=> x - 9 = 0 - ( -12 )
=> x = 0 + 12 + 9
=> x = 21
Vậy : x = 21
=> x-9 = 0 - (-12)
=> x-9 = 12
=> x = 12 + 9
=> x = 21
Vậy x = 21
Tk mk nha