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x in (-oo:+oo)
y+1 = (2/5)*(x-5) // - (2/5)*(x-5)
y-((2/5)*(x-5))+1 = 0
(-2/5)*(x-5)+y+1 = 0
y-2/5*(x-5)+1 = 0
y-2/5*(x-5)+1 = 0
y-2/5*x+1+2 = 0
y-2/5*x+3 = 0
y-2/5*x+3 = 0
y-2/5*x+3 = 0 // - y+3
-2/5*x = -(y+3) // : -2/5
x = (-(y+3))/(-2/5)
x = 5/2*(y+3)
x = 5/2*(y+3)
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