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41*x-(21/2)+4009 = 9-x+41 // - 9-x+41
41*x+x-(21/2)-41-9+4009 = 0
41*x+x-21/2-41-9+4009 = 0
42*x+7897/2 = 0 // - 7897/2
42*x = -7897/2 // : 42
x = -7897/2/42
x = -7897/84
x = -7897/84
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