(86+93+a)/3=90

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Solution for (86+93+a)/3=90 equation: 


a in (-oo:+oo)

(a+86+93)/3 = 90 // - 90

(a+86+93)/3-90 = 0

(a+179)/3-90 = 0

(a+179)/3+(-90*3)/3 = 0

a-90*3+179 = 0

a-91 = 0

(a-91)/3 = 0

(a-91)/3 = 0 // * 3

a-91 = 0

a-91 = 0 // + 91

a = 91

a = 91

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