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x in (-oo:+oo)
x/3-(x/10) = 11/30 // - 11/30
x/3-(x/10)-(11/30) = 0
x/3-(x/10)-11/30 = 0
7/30*x-11/30 = 0 // + 11/30
7/30*x = 11/30 // : 7/30
x = 11/30/7/30
x = 11/7
x = 11/7
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