(72+87+x)/3=80

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Solution for (72+87+x)/3=80 equation: 


x in (-oo:+oo)

(x+72+87)/3 = 80 // - 80

(x+72+87)/3-80 = 0

(x+159)/3-80 = 0

(x+159)/3+(-80*3)/3 = 0

x-80*3+159 = 0

x-81 = 0

(x-81)/3 = 0

(x-81)/3 = 0 // * 3

x-81 = 0

x-81 = 0 // + 81

x = 81

x = 81

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