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x in (-oo:+oo)
x/2-x-(1/3) = 7 // - 7
x/2-x-(1/3)-7 = 0
x/2-x-1/3-7 = 0
-1/2*x-22/3 = 0 // + 22/3
-1/2*x = 22/3 // : -1/2
x = 22/3/(-1/2)
x = -44/3
x = -44/3
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