Odpowiedź:
28x + 4 = 11x + 38
28x - 11x = 38 - 4
17x = 34 |:17
x = 2
2,2x + 2 = 3,7x - 7
2,2x - 3,7x = -7 - 2
-1,5x = -9 |:-1,5
x = 6
(x-2)7 = 4(x+1) -3
7x - 14 = 4x + 4 - 3
7x - 14 = 4x + 1
7x - 4x = 1 + 14
3x = 15 |:3
x = 5
23 - x = 7 - x2
-x + 2x = 7 - 23
x = -16