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