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2x+2y=3xy|×3|6x+6y=9xy
------------------------------------(-)
-2y = -xy
-2 = -x
x = 2
3x + 2y = 4xy
3.2 + 2y = 4.2y
6 + 2y = 8y
6 = 8y - 2y = 6y
y = 6 : 6 = 1