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