Odpowiedź:
0,9x-1,5=1 i 7/8
0,9x - 3/2 = 15/8
9/10x = 15/8 + 3/2
9/10x = 15/8 + 12/8
9/10x = 27/8 I *10
9x = 270/8 I :9
x = 270/72 = 3 i 54/72 = 3 i 3/4
Sprawdzenie
0,9 * 3 i 3/4 - 1,5 = 1 i 7/8
9/10 * 15/4 - 3/2 = 1 i 7/8
135/40 - 3/2 = 1 i 7/8
27/8 - 12/8 = 1 i 7/8
15/8 = 1 i 7/8
1 i 7/8 = 1 i 7/8