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x in (-oo:+oo)
x/9 = 12/10 // - 12/10
x/9-(12/10) = 0
x/9-6/5 = 0
1/9*x-6/5 = 0 // + 6/5
1/9*x = 6/5 // : 1/9
x = 6/5/1/9
x = 54/5
x = 54/5
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