(85+87+89+x)/4=90

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Solution for (85+87+89+x)/4=90 equation: 


x in (-oo:+oo)

(x+85+87+89)/4 = 90 // - 90

(x+85+87+89)/4-90 = 0

(x+261)/4-90 = 0

(x+261)/4+(-90*4)/4 = 0

x-90*4+261 = 0

x-99 = 0

(x-99)/4 = 0

(x-99)/4 = 0 // * 4

x-99 = 0

x-99 = 0 // + 99

x = 99

x = 99

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