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x in (-oo:+oo)
5/10 = (x+1)/2 // - (x+1)/2
5/10-((x+1)/2) = 0
(-1*(x+1))/2+1/2 = 0
1-1*(x+1) = 0
-x = 0
-x/2 = 0
-x/2 = 0 // * 2
-x = 0
-1*x = 0 // : -1
x = 0
x = 0
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