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x in (-oo:+oo)
6/51 = 3*x // - 3*x
6/51-(3*x) = 0
6/51-3*x = 0
2/17-3*x = 0 // - 2/17
-3*x = -2/17 // : -3
x = -2/17/(-3)
x = 2/51
x = 2/51
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