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x in (-oo:+oo)
17/56 = x/51 // - x/51
17/56-(x/51) = 0
17/56-1/51*x = 0 // - 17/56
-1/51*x = -17/56 // : -1/51
x = -17/56/(-1/51)
x = 867/56
x = 867/56
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