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x in (-oo:+oo)
82 = (x+100)/2 // - (x+100)/2
82-((x+100)/2) = 0
(-1*(x+100))/2+82 = 0
(-1*(x+100))/2+(2*82)/2 = 0
2*82-1*(x+100) = 0
64-x = 0
(64-x)/2 = 0
(64-x)/2 = 0 // * 2
64-x = 0
64-x = 0 // - 64
-x = -64 // * -1
x = 64
x = 64
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