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2x+2y=6 /:2
2x - y = 5
x + y = 3
2x - y = 5
x = 5 + y
2(5 + y) - y = 5
x = 5 + y
10 + 2y - y = 5
x = 5 + y
y = -5
x = 5 + (-5)
y = -5
x = 0