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x in (-oo:+oo)
7-((1/6)*x) = 2 // - 2
7-((1/6)*x)-2 = 0
(-1/6)*x-2+7 = 0
5-1/6*x = 0 // - 5
-1/6*x = -5 // : -1/6
x = -5/(-1/6)
x = 30
x = 30
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