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x in (-oo:+oo)
122/4 = (4*x)/4 // - (4*x)/4
122/4-((4*x)/4) = 0
122/4-x = 0
61/2-x = 0 // - 61/2
-x = -61/2 // * -1
x = 61/2
x = 61/2
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