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x in (-oo:+oo)
-((7/3)*x) = 2/11 // - 2/11
-((7/3)*x)-(2/11) = 0
(-7/3)*x-2/11 = 0
-7/3*x-2/11 = 0 // + 2/11
-7/3*x = 2/11 // : -7/3
x = 2/11/(-7/3)
x = -6/77
x = -6/77
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