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x in (-oo:+oo)
x/9 = 10/5 // - 10/5
x/9-(10/5) = 0
x/9-2 = 0
1/9*x-2 = 0 // + 2
1/9*x = 2 // : 1/9
x = 2/1/9
x = 18
x = 18
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