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x in (-oo:+oo)
0.8/1 = x/1.5 // - x/1.5
0.8/1-(x/1.5) = 0
0.8-0.66666667*x = 0
0.8-0.66666667*x = 0 // - 0.8
-0.66666667*x = -0.8 // : -0.66666667
x = -0.8/(-0.66666667)
x = 1.19999999
x = 1.19999999
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