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x in (-oo:+oo)
11.5/15 = x/10 // - x/10
11.5/15-(x/10) = 0
0.76666667-1/10*x = 0 // - 0.76666667
-1/10*x = -0.76666667 // : -1/10
x = -0.76666667/(-1/10)
x = 7.6666667
x = 7.6666667
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