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25-15 = 6y-4y ==> Samakan variabel
10 = 2y
5 =y
⇔25-25 -4y = 6y + 15+25
⇔ -4y = 6y + 40
⇔-4y - 6y = 6y-6y +40
⇔ 2y = 40
⇔ 2y = 40
2 2
⇔y = 20
Jadi Himpunan penyelesaian y= 20