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x in (-oo:+oo)
1.2/3 = x/2 // - x/2
1.2/3-(x/2) = 0
0.4-1/2*x = 0 // - 0.4
-1/2*x = -0.4 // : -1/2
x = -0.4/(-1/2)
x = 0.8
x = 0.8
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