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x in (-oo:+oo)
(x+80+85+95)/4 = 90 // - 90
(x+80+85+95)/4-90 = 0
(x+260)/4-90 = 0
(x+260)/4+(-90*4)/4 = 0
x-90*4+260 = 0
x-100 = 0
(x-100)/4 = 0
(x-100)/4 = 0 // * 4
x-100 = 0
x-100 = 0 // + 100
x = 100
x = 100
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