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D in (-oo:+oo)
-1 = (D+5)/2 // - (D+5)/2
-((D+5)/2)-1 = 0
(-1*(D+5))/2-1 = 0
(-1*(D+5))/2+(-1*2)/2 = 0
-1*(D+5)-1*2 = 0
-D-7 = 0
(-D-7)/2 = 0
(-D-7)/2 = 0 // * 2
-D-7 = 0
-D-7 = 0 // + 7
-D = 7 // * -1
D = -7
D = -7
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