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x in (-oo:+oo)
Y-3 = (7/8)*(x-4) // - (7/8)*(x-4)
Y-((7/8)*(x-4))-3 = 0
(-7/8)*(x-4)+Y-3 = 0
Y-7/8*(x-4)-3 = 0
Y-7/8*(x-4)-3 = 0
Y-7/8*x-3+7/2 = 0
Y-7/8*x+1/2 = 0
Y-7/8*x+1/2 = 0
Y-7/8*x+1/2 = 0 // - Y+1/2
-7/8*x = -(Y+1/2) // : -7/8
x = (-(Y+1/2))/(-7/8)
x = 8/7*(Y+1/2)
x = 8/7*(Y+1/2)
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