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x in (-oo:+oo)
90 = (x+85+93)/3 // - (x+85+93)/3
90-((x+85+93)/3) = 0
(-1*(x+178))/3+90 = 0
(-1*(x+178))/3+(3*90)/3 = 0
3*90-1*(x+178) = 0
92-x = 0
(92-x)/3 = 0
(92-x)/3 = 0 // * 3
92-x = 0
92-x = 0 // - 92
-x = -92 // * -1
x = 92
x = 92
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