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-3x + 5y = 2
6x - 3y = 3
-6x + 10y = 4
---------------------+
7y = 7
y =1
2x - y = 1
2x - 7 = 1
2x = 8
x = 4
x + y = 4 + 1 = 5
semoga membantu! ^^