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x in (-oo:+oo)
80/120 = x/2 // - x/2
80/120-(x/2) = 0
2/3-1/2*x = 0 // - 2/3
-1/2*x = -2/3 // : -1/2
x = -2/3/(-1/2)
x = 4/3
x = 4/3
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