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x in (-oo:+oo)
y = 25/2-5*x // - 25/2-5*x
y-(-5*x)-(25/2) = 0
5*x+y-25/2 = 0
5*x+y-25/2 = 0 // - y-25/2
5*x = -(y-25/2) // : 5
x = (-(y-25/2))/5
x = (25/2-y)/5
x = (25/2-y)/5
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