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6x + 7x = 11.750 | x1 | 15x + 0y = 11.750
3x + 4y = 5.750 | x5 | 15x + 20y = 28.750 -
-20y = -17000
y = -17000 = 850
- 20
15x + y = 11.750
15x + 850 = 11.750
15x = 11.750 - 850
x = 10.900 = 726
15