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x in (-oo:+oo)
27.5/12 = x/3 // - x/3
27.5/12-(x/3) = 0
2.29166667-1/3*x = 0 // - 2.29166667
-1/3*x = -2.29166667 // : -1/3
x = -2.29166667/(-1/3)
x = 6.87500008
x = 6.87500008
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