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x in (-oo:+oo)
14 = (7/9)*x // - (7/9)*x
14-((7/9)*x) = 0
(-7/9)*x+14 = 0
14-7/9*x = 0 // - 14
-7/9*x = -14 // : -7/9
x = -14/(-7/9)
x = 18
x = 18
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