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x in (-oo:+oo)
-x-(11/3) = 21 // - 21
-x-(11/3)-21 = 0
-x-11/3-21 = 0
-x-74/3 = 0 // + 74/3
-x = 74/3 // * -1
x = -74/3
x = -74/3
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