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y = 7/8
maaf kalau salah
3x-5y=17
---ditambah---
5x+0=40
5x=40
x= 40/5
x= 8
2x+5y=23
2(8)+5y=23
16 + 5y = 23
5y = 23-16
5y = 7
y = 7/5