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x in (-oo:+oo)
Y+1 = (7/2)*(x+4) // - (7/2)*(x+4)
Y-((7/2)*(x+4))+1 = 0
(-7/2)*(x+4)+Y+1 = 0
Y-7/2*(x+4)+1 = 0
Y-7/2*(x+4)+1 = 0
Y-7/2*x-14+1 = 0
Y-7/2*x-13 = 0
Y-7/2*x-13 = 0
Y-7/2*x-13 = 0 // - Y-13
-7/2*x = -(Y-13) // : -7/2
x = (-(Y-13))/(-7/2)
x = -2/7*(13-Y)
x = -2/7*(13-Y)
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