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x in (-oo:+oo)
8/12 = x/(-2) // - x/(-2)
8/12-(x/(-2)) = 0
1/2*x+2/3 = 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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