Răspuns :
2x - 3 = 7
2x = 7 + 3
2x = 10
x = 10 : 2
x = 5
2x - 3 = -7
2x = -7 +3
2x = -4
x = -4 : 2
x = -2
x ={ -2; 5}
2x = 7 + 3
2x = 10
x = 10 : 2
x = 5
2x - 3 = -7
2x = -7 +3
2x = -4
x = -4 : 2
x = -2
x ={ -2; 5}
| 2x-3 | = 7
2x-3=-7
2x=-7+3
2x=-4
x=-4:2
x=-2
2x-3=7
2x=7+3
2x=10
x=5
x = (-2 ; 5)
2x-3=-7
2x=-7+3
2x=-4
x=-4:2
x=-2
2x-3=7
2x=7+3
2x=10
x=5
x = (-2 ; 5)