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x in (-oo:+oo)
1.6/2 = x/9 // - x/9
1.6/2-(x/9) = 0
0.8-1/9*x = 0 // - 0.8
-1/9*x = -0.8 // : -1/9
x = -0.8/(-1/9)
x = 7.20000007
x = 7.20000007
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