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