(78+x)/2=80

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Solution for (78+x)/2=80 equation: 


x in (-oo:+oo)

(x+78)/2 = 80 // - 80

(x+78)/2-80 = 0

(x+78)/2+(-80*2)/2 = 0

x-80*2+78 = 0

x-82 = 0

(x-82)/2 = 0

(x-82)/2 = 0 // * 2

x-82 = 0

x-82 = 0 // + 82

x = 82

x = 82

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