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x in (-oo:+oo)
y-7 = (-15/13)*(x+6) // - (-15/13)*(x+6)
y-((-15/13)*(x+6))-7 = 0
(15/13)*(x+6)+y-7 = 0
15/13*(x+6)+y-7 = 0
15/13*(x+6)+y-7 = 0
15/13*x+y-7+90/13 = 0
15/13*x+y-1/13 = 0
15/13*x+y-1/13 = 0
15/13*x+y-1/13 = 0 // - y-1/13
15/13*x = -(y-1/13) // : 15/13
x = (-(y-1/13))/15/13
x = 13/15*(1/13-y)
x = 13/15*(1/13-y)
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