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x in (-oo:+oo)
(10/11)*x-(9/11) = 7 // - 7
(10/11)*x-(9/11)-7 = 0
(10/11)*x-9/11-7 = 0
10/11*x-86/11 = 0 // + 86/11
10/11*x = 86/11 // : 10/11
x = 86/11/10/11
x = 43/5
x = 43/5
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