-2x - (x-17) = 34 - (-x+25)
-2x-x+17 = 34+x-25
-3x+17 = x+9
-3x-x = 9-17
-4x = -8
x = -8 : (-4)
x = 2
vậy____
-2x-(x-17)=34-(-x+25)
=> -2x-x+17=34+x-25
=> -3x+17=x+9
=> -3x-x=9-17
= -4x=-8 => x=2
-2x-(x-17)=34-(-x+25)
=> -2x-x+17=34+x-25
=> -3x+17=x+9
=> -3x-x=9-17
= -4x=-8 => x=2
-2x-(x-17)=34-(-x+25)
-2x-x+17=34+x-25
-3x+17=x+9
-3x-x=9-17
-4x=-8
x=-8:(-4)
x=2