Odpowiedź:
-2,5x = 7,5
-2,5x = 7,5/:(-2,5)
x = 7,5: (-2,5)
x = -3
-12x = -60
-12x = -60/:(-12)
x = -60 :(-12)
x = 5
7½x = 10
7½x = 10/:7½
x = 10 : 7½
x = 10/1 : 15/2
x = 10/1 * 2/15
x = 2/1 * 2/3
x = 4/3
x = 1 1/3
6x = -66
6x = -66/:6
x = -66 : 6
x = -11