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x in (-oo:+oo)
x/7-(13/11) = 0
x/7-13/11 = 0
1/7*x-13/11 = 0 // + 13/11
1/7*x = 13/11 // : 1/7
x = 13/11/1/7
x = 91/11
x = 91/11
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