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x in (-oo:+oo)
x/10 = 9/45 // - 9/45
x/10-(9/45) = 0
x/10-1/5 = 0
1/10*x-1/5 = 0 // + 1/5
1/10*x = 1/5 // : 1/10
x = 1/5/1/10
x = 2
x = 2
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