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x in (-oo:+oo)
y = 5/5-(2*x) // - 5/5-(2*x)
2*x+y-(5/5) = 0
2*x+y-1 = 0
2*x+y-1 = 0 // - y-1
2*x = -(y-1) // : 2
x = (-(y-1))/2
x = (1-y)/2
x = (1-y)/2
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