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x in (-oo:+oo)
Y-3 = (7/13)*(x-4) // - (7/13)*(x-4)
Y-((7/13)*(x-4))-3 = 0
(-7/13)*(x-4)+Y-3 = 0
Y-7/13*(x-4)-3 = 0
Y-7/13*(x-4)-3 = 0
Y-7/13*x-3+28/13 = 0
Y-7/13*x-11/13 = 0
Y-7/13*x-11/13 = 0
Y-7/13*x-11/13 = 0 // - Y-11/13
-7/13*x = -(Y-11/13) // : -7/13
x = (-(Y-11/13))/(-7/13)
x = -13/7*(11/13-Y)
x = -13/7*(11/13-Y)
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