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x in (-oo:+oo)
(x+45)/2 = 36 // - 36
(x+45)/2-36 = 0
(x+45)/2+(-36*2)/2 = 0
x-36*2+45 = 0
x-27 = 0
(x-27)/2 = 0
(x-27)/2 = 0 // * 2
x-27 = 0
x-27 = 0 // + 27
x = 27
x = 27
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