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