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x in (-oo:+oo)
5/12 = (x+1)/4 // - (x+1)/4
5/12-((x+1)/4) = 0
(-1*(x+1))/4+5/12 = 0
(-1*12*(x+1))/(4*12)+(4*5)/(4*12) = 0
4*5-1*12*(x+1) = 0
8-12*x = 0
(8-12*x)/(4*12) = 0
(8-12*x)/(4*12) = 0 // * 4*12
8-12*x = 0
8-12*x = 0 // - 8
-12*x = -8 // : -12
x = -8/(-12)
x = 2/3
x = 2/3
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