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x in (-oo:+oo)
y+1 = (4/5)*(x-7) // - (4/5)*(x-7)
y-((4/5)*(x-7))+1 = 0
(-4/5)*(x-7)+y+1 = 0
y-4/5*(x-7)+1 = 0
y-4/5*(x-7)+1 = 0
y-4/5*x+1+28/5 = 0
y-4/5*x+33/5 = 0
y-4/5*x+33/5 = 0
y-4/5*x+33/5 = 0 // - y+33/5
-4/5*x = -(y+33/5) // : -4/5
x = (-(y+33/5))/(-4/5)
x = 5/4*(y+33/5)
x = 5/4*(y+33/5)
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