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x in (-oo:+oo)
Y-(1/4) = 2*(x-4) // - 2*(x-4)
Y-(2*(x-4))-(1/4) = 0
Y-2*(x-4)-1/4 = 0
(-2*4*(x-4))/4+(4*Y)/4-1/4 = 0
4*Y-2*4*(x-4)-1 = 0
4*Y-8*x-1+32 = 0
4*Y-8*x+31 = 0
(4*Y-8*x+31)/4 = 0
(4*Y-8*x+31)/4 = 0 // * 4
4*Y-8*x+31 = 0
4*Y-8*x+31 = 0 // - 4*Y+31
-8*x = -(4*Y+31) // : -8
x = (-(4*Y+31))/(-8)
x = (4*Y+31)/8
x = (4*Y+31)/8
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