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x in (-oo:+oo)
x = (y-20-3)/4 // - (y-20-3)/4
x-((y-20-3)/4) = 0
(-1*(y-23))/4+x = 0
(-1*(y-23))/4+(4*x)/4 = 0
4*x-1*(y-23) = 0
4*x-y+23 = 0
(4*x-y+23)/4 = 0
(4*x-y+23)/4 = 0 // * 4
4*x-y+23 = 0
4*x-y+23 = 0 // - 23-y
4*x = -(23-y) // : 4
x = (-(23-y))/4
x = (y-23)/4
x = (y-23)/4
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