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x in (-oo:+oo)
Y-13 = (-7/6)*(x+11) // - (-7/6)*(x+11)
Y-((-7/6)*(x+11))-13 = 0
(7/6)*(x+11)+Y-13 = 0
7/6*(x+11)+Y-13 = 0
7/6*(x+11)+Y-13 = 0
Y+7/6*x-13+77/6 = 0
Y+7/6*x-1/6 = 0
Y+7/6*x-1/6 = 0
Y+7/6*x-1/6 = 0 // - Y-1/6
7/6*x = -(Y-1/6) // : 7/6
x = (-(Y-1/6))/7/6
x = 6/7*(1/6-Y)
x = 6/7*(1/6-Y)
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