(4-x) + (4-15)= -15
4-x+4-15 = -15
(4+4) - 15 - x = -15
8 - 15 - x = -15
-7 - x = -15
x = -7 - (-15)
x = 8
vậy_____
( 4 - X ) + ( 4 - 15 ) = -15
4 - X + ( -11 ) = -15
4 - X = -15 + 11
4 - X = -4
X = 4 - ( -4 )
X = 8
Vậy X = 8
(4-X) + (4-15)= -15
(4-x) - 11 = -15
(4-x) = -15+ 11
4 - x =-4
x= 4-(-4)
x=8
( 4 - x ) + ( 4 - 15 ) = -15
( 4 - x ) + ( -11) = -15
( 4 - x ) = -15 + ( -11 )
( 4 - x ) = -26
x = 4 - ( -26 )
x = 4 + 26
x = 30
Tích nha ! Mọi người