8.y+y.17= 15675
(8+17).y=15675
25.y=15675
y=15675:25
y=627
=> 25y = 15675
=> y = 15675 : 25
=> y = 627
Vậy...
8y + 17y = 15675
<=> y( 8 +17 ) = 15675
<=> 25y = 15675
<=> y = 15675 : 25 = 627
8y + y.17 = 15675
y.(8 + 17) = 15675
y.25 = 15675
y = 627