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x in (-oo:+oo)
x/9 = 10/6 // - 10/6
x/9-(10/6) = 0
x/9-5/3 = 0
1/9*x-5/3 = 0 // + 5/3
1/9*x = 5/3 // : 1/9
x = 5/3/1/9
x = 15
x = 15
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