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x in (-oo:+oo)
6.4/3.6 = x/1.5 // - x/1.5
6.4/3.6-(x/1.5) = 0
6.4/3.6-0.66666667*x = 0
1.77777778-0.66666667*x = 0 // - 1.77777778
-0.66666667*x = -1.77777778 // : -0.66666667
x = -1.77777778/(-0.66666667)
x = 2.66666666
x = 2.66666666
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