8 - ( x - 10 ) = 23 - ( -4 + 12 )
8 - x + 10 = 23 - 8
( 10 + 8 ) - x = 15
18 - x = 15
x = 18 - 15 = 3
8 - ( x -10 ) = 23 - ( -4 + 12 )
8 - x + 10 = 23 + 4 - 12
8 - x + 10 = 15
8 - x = 5
x = 3
\(8-\left(x-10\right)=23-\left(-4=12\right)\)
\(\Leftrightarrow8-x+10=23+4-12\)
\(\Leftrightarrow18-x=15\)
\(\Leftrightarrow x=3\)
Vậy x= 3