(409+x)/2=81

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Solution for (409+x)/2=81 equation: 


x in (-oo:+oo)

(x+409)/2 = 81 // - 81

(x+409)/2-81 = 0

(x+409)/2+(-81*2)/2 = 0

x-81*2+409 = 0

x+247 = 0

(x+247)/2 = 0

(x+247)/2 = 0 // * 2

x+247 = 0

x+247 = 0 // - 247

x = -247

x = -247

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