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x in (-oo:+oo)
x/5-(4/5) = 9 // - 9
x/5-(4/5)-9 = 0
x/5-4/5-9 = 0
1/5*x-49/5 = 0 // + 49/5
1/5*x = 49/5 // : 1/5
x = 49/5/1/5
x = 49
x = 49
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