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x in (-oo:+oo)
y-13 = (8/9)*(x-3) // - (8/9)*(x-3)
y-((8/9)*(x-3))-13 = 0
(-8/9)*(x-3)+y-13 = 0
y-8/9*(x-3)-13 = 0
y-8/9*(x-3)-13 = 0
y-8/9*x-13+8/3 = 0
y-8/9*x-31/3 = 0
y-8/9*x-31/3 = 0
y-8/9*x-31/3 = 0 // - y-31/3
-8/9*x = -(y-31/3) // : -8/9
x = (-(y-31/3))/(-8/9)
x = -9/8*(31/3-y)
x = -9/8*(31/3-y)
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