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x in (-oo:+oo)
x/5+x/6 = 11/30 // - 11/30
x/5+x/6-(11/30) = 0
x/5+x/6-11/30 = 0
11/30*x-11/30 = 0 // + 11/30
11/30*x = 11/30 // : 11/30
x = 11/30/11/30
x = 1
x = 1
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