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x in (-oo:+oo)
(x+93)/2 = 84 // - 84
(x+93)/2-84 = 0
(x+93)/2+(-84*2)/2 = 0
x-84*2+93 = 0
x-75 = 0
(x-75)/2 = 0
(x-75)/2 = 0 // * 2
x-75 = 0
x-75 = 0 // + 75
x = 75
x = 75
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