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x in (-oo:+oo)
(8/9)*x-(1/6) = 7 // - 7
(8/9)*x-(1/6)-7 = 0
(8/9)*x-1/6-7 = 0
8/9*x-43/6 = 0 // + 43/6
8/9*x = 43/6 // : 8/9
x = 43/6/8/9
x = 129/16
x = 129/16
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