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x in (-oo:+oo)
y-6 = (5/(-2))*(x-6) // - (5/(-2))*(x-6)
y-((5/(-2))*(x-6))-6 = 0
(5/2)*(x-6)+y-6 = 0
5/2*(x-6)+y-6 = 0
5/2*(x-6)+y-6 = 0
5/2*x+y-15-6 = 0
5/2*x+y-21 = 0
5/2*x+y-21 = 0
5/2*x+y-21 = 0 // - y-21
5/2*x = -(y-21) // : 5/2
x = (-(y-21))/5/2
x = 2/5*(21-y)
x = 2/5*(21-y)
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