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x in (-oo:+oo)
Y-6 = (5/6)*(x+18) // - (5/6)*(x+18)
Y-((5/6)*(x+18))-6 = 0
(-5/6)*(x+18)+Y-6 = 0
Y-5/6*(x+18)-6 = 0
Y-5/6*(x+18)-6 = 0
Y-5/6*x-15-6 = 0
Y-5/6*x-21 = 0
Y-5/6*x-21 = 0
Y-5/6*x-21 = 0 // - Y-21
-5/6*x = -(Y-21) // : -5/6
x = (-(Y-21))/(-5/6)
x = -6/5*(21-Y)
x = -6/5*(21-Y)
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