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= y + (3y) + (4y + 1)
= y + 3y + 4y + 1
= 8y + 1
8y + 1 = 25
8y = 25 - 1
8y = 24
y = 24 : 8
y = 3
Maka bilangan itu :
y ------------> 3
3y ----------> 9
4y + 1 ----> 13