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X in (-oo:+oo)
(-3/7)*X = X+1/3 // - X+1/3
(-3/7)*X-X-(1/3) = 0
(-3/7)*X-X-1/3 = 0
-10/7*X-1/3 = 0 // + 1/3
-10/7*X = 1/3 // : -10/7
X = 1/3/(-10/7)
X = -7/30
X = -7/30
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