Răspuns :
1.
-2x +3 = -7
-2x = -10
x = 5
2.
2mx +3 = -5 , x = -1
-2m + 3 = -5
-2m = -8
m = 4
3.
-0.08(3)x + 3 = -2
-0.24x + 3 = -2
-0.24x = -5
x = 20,8(3)
4.
x - 31 = 7
x = 38 apartine N
5.
-5x + 9 = 7x - 3(x-6)
-5x +9 = 7x - 3x + 18
-9x = 9
x = -1
6.
2x + 11 = 9
2x = 9 - 11
2x = -2
x = -1