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x in (-oo:+oo)
(1/3)*x-((1/2)*x) = 7/6 // - 7/6
(1/3)*x-((1/2)*x)-(7/6) = 0
(1/3)*x+(-1/2)*x-7/6 = 0
-1/6*x-7/6 = 0 // + 7/6
-1/6*x = 7/6 // : -1/6
x = 7/6/(-1/6)
x = -7
x = -7
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