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