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x in (-oo:+oo)
7-(x/3) = x/6 // - x/6
7-(x/3)-(x/6) = 0
7-1/2*x = 0 // - 7
-1/2*x = -7 // : -1/2
x = -7/(-1/2)
x = 14
x = 14
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