(85+95+80+x)/4=90

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Solution for (85+95+80+x)/4=90 equation: 


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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