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x in (-oo:+oo)
(x+88)/2 = 90 // - 90
(x+88)/2-90 = 0
(x+88)/2+(-90*2)/2 = 0
x-90*2+88 = 0
x-92 = 0
(x-92)/2 = 0
(x-92)/2 = 0 // * 2
x-92 = 0
x-92 = 0 // + 92
x = 92
x = 92
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