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x in (-oo:+oo)
55/6-x = 21/6 // - 21/6
55/6-x-(21/6) = 0
55/6-x-7/2 = 0
17/3-x = 0 // - 17/3
-x = -17/3 // * -1
x = 17/3
x = 17/3
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