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x in (-oo:+oo)
(x-4)/2 = 9 // - 9
(x-4)/2-9 = 0
(x-4)/2+(-9*2)/2 = 0
x-9*2-4 = 0
x-22 = 0
(x-22)/2 = 0
(x-22)/2 = 0 // * 2
x-22 = 0
x-22 = 0 // + 22
x = 22
x = 22
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