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x in (-oo:+oo)
y = 16/8-5*x // - 16/8-5*x
y-(-5*x)-(16/8) = 0
5*x+y-2 = 0
5*x+y-2 = 0 // - y-2
5*x = -(y-2) // : 5
x = (-(y-2))/5
x = (2-y)/5
x = (2-y)/5
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