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x + 3y = 9
x = 9 - 3y
2 (9-3y) + 3y = 37
18 - 6y +3y = 37
- 3y = 19
y = - 19/3
y = 6, 33
x = 9 -3(- 19/3)
x = 9 +19
x = 28