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x in (-oo:+oo)
-7*x = -(14/9) // + 14/9
14/9-7*x = 0
14/9-7*x = 0 // - 14/9
-7*x = -14/9 // : -7
x = -14/9/(-7)
x = 2/9
x = 2/9
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