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x in (-oo:+oo)
y-5 = (1/5)*(x-5) // - (1/5)*(x-5)
y-((1/5)*(x-5))-5 = 0
(-1/5)*(x-5)+y-5 = 0
y-1/5*(x-5)-5 = 0
y-1/5*(x-5)-5 = 0
y-1/5*x-5+1 = 0
y-1/5*x-4 = 0
y-1/5*x-4 = 0
y-1/5*x-4 = 0 // - y-4
-1/5*x = -(y-4) // : -1/5
x = (-(y-4))/(-1/5)
x = -5*(4-y)
x = -5*(4-y)
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