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x in (-oo:+oo)
x/81 = 80/22 // - 80/22
x/81-(80/22) = 0
x/81-40/11 = 0
1/81*x-40/11 = 0 // + 40/11
1/81*x = 40/11 // : 1/81
x = 40/11/1/81
x = 3240/11
x = 3240/11
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