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x in (-oo:+oo)
(x+79+82+85+89)/5 = 85 // - 85
(x+79+82+85+89)/5-85 = 0
(x+335)/5-85 = 0
(x+335)/5+(-85*5)/5 = 0
x-85*5+335 = 0
x-90 = 0
(x-90)/5 = 0
(x-90)/5 = 0 // * 5
x-90 = 0
x-90 = 0 // + 90
x = 90
x = 90
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