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