Jawabanmu

2014-02-10T16:38:32+07:00
25 - 4y = 6y + 15
25 - 25 - 4y = 6y + 15 - 25
-4y = 6y - 10
-4y - 6y = 6y - 6y - 10
-10y = -10
-10y : -10 = -10 : -10
y = 1
Jadi penyelesaiannya y = 1
25 - 4y =6y +15
-4y + -6y = 15 -25
-10y = 10
y
y = 1
2014-02-10T16:42:23+07:00
25 - 4y = 6y + 15
25 - 15 = 6y + 4y 
      10 = 10y 
        y = 10 : 10 
        y = 1