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x in (-oo:+oo)
x/9-3 = 7/18 // - 7/18
x/9-(7/18)-3 = 0
x/9-7/18-3 = 0
1/9*x-61/18 = 0 // + 61/18
1/9*x = 61/18 // : 1/9
x = 61/18/1/9
x = 61/2
x = 61/2
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