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x in (-oo:+oo)
y-((5/2)*x) = 4 // - 4
y-((5/2)*x)-4 = 0
(-5/2)*x+y-4 = 0
y-5/2*x-4 = 0 // - y-4
-5/2*x = -(y-4) // : -5/2
x = (-(y-4))/(-5/2)
x = -2/5*(4-y)
x = -2/5*(4-y)
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