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x in (-oo:+oo)
y-6 = (7/9)*(x+3) // - (7/9)*(x+3)
y-((7/9)*(x+3))-6 = 0
(-7/9)*(x+3)+y-6 = 0
y-7/9*(x+3)-6 = 0
y-7/9*(x+3)-6 = 0
y-7/9*x-6-7/3 = 0
y-7/9*x-25/3 = 0
y-7/9*x-25/3 = 0
y-7/9*x-25/3 = 0 // - y-25/3
-7/9*x = -(y-25/3) // : -7/9
x = (-(y-25/3))/(-7/9)
x = -9/7*(25/3-y)
x = -9/7*(25/3-y)
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