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x in (-oo:+oo)
3-(x/3) = 16-7 // - 16-7
3-(x/3)-16+7 = 0
-1/3*x-6 = 0 // + 6
-1/3*x = 6 // : -1/3
x = 6/(-1/3)
x = -18
x = -18
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