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x in (-oo:+oo)
x/9 = 15/10 // - 15/10
x/9-(15/10) = 0
x/9-3/2 = 0
1/9*x-3/2 = 0 // + 3/2
1/9*x = 3/2 // : 1/9
x = 3/2/1/9
x = 27/2
x = 27/2
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