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x in (-oo:+oo)
2.2/6 = x/15 // - x/15
2.2/6-(x/15) = 0
0.36666667-1/15*x = 0 // - 0.36666667
-1/15*x = -0.36666667 // : -1/15
x = -0.36666667/(-1/15)
x = 5.49999978
x = 5.49999978
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