(77+83+89+86+x)/5=85

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Solution for (77+83+89+86+x)/5=85 equation: 


x in (-oo:+oo)

(x+77+83+86+89)/5 = 85 // - 85

(x+77+83+86+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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