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x in (-oo:+oo)
6 = (68/7)*x // - (68/7)*x
6-((68/7)*x) = 0
(-68/7)*x+6 = 0
6-68/7*x = 0 // - 6
-68/7*x = -6 // : -68/7
x = -6/(-68/7)
x = 21/34
x = 21/34
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