1) 3x + 2x = 17 + (-21)
3x + 2x = 17 – 21
3x + 2x = – 21 + 17
5x = -4
x = -0.8
2) 6x - 7x = 3,5 • (-1)+4
6x – 7x = – 3.5 + 4
6x – 7x = 4 – 3,5
-x = 0.5
x = -0.5
3) 1,3x - 3,5x = 11• (-0,5)
1.3x – 3.5x = – 5.5
1,3x – 3,5x = – 5,5
-2.2x = -5.5
x = 2.5
1) 3x + 2x = 17 + (-21)
3x + 2x = 17 – 21
3x + 2x = – 21 + 17
5x = -4
x = -0.8
2) 6x - 7x = 3,5 • (-1)+4
6x – 7x = – 3.5 + 4
6x – 7x = 4 – 3,5
-x = 0.5
x = -0.5
3) 1,3x - 3,5x = 11• (-0,5)
1.3x – 3.5x = – 5.5
1,3x – 3,5x = – 5,5
-2.2x = -5.5
x = 2.5