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x in (-oo:+oo)
(8/9)*x-(7/9) = 5 // - 5
(8/9)*x-(7/9)-5 = 0
(8/9)*x-7/9-5 = 0
8/9*x-52/9 = 0 // + 52/9
8/9*x = 52/9 // : 8/9
x = 52/9/8/9
x = 13/2
x = 13/2
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