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x in (-oo:+oo)
Y+1 = (9/8)*(x-6) // - (9/8)*(x-6)
Y-((9/8)*(x-6))+1 = 0
(-9/8)*(x-6)+Y+1 = 0
Y-9/8*(x-6)+1 = 0
Y-9/8*(x-6)+1 = 0
Y-9/8*x+1+27/4 = 0
Y-9/8*x+31/4 = 0
Y-9/8*x+31/4 = 0
Y-9/8*x+31/4 = 0 // - Y+31/4
-9/8*x = -(Y+31/4) // : -9/8
x = (-(Y+31/4))/(-9/8)
x = 8/9*(Y+31/4)
x = 8/9*(Y+31/4)
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