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x in (-oo:+oo)
x/660 = 130/55 // - 130/55
x/660-(130/55) = 0
x/660-26/11 = 0
1/660*x-26/11 = 0 // + 26/11
1/660*x = 26/11 // : 1/660
x = 26/11/1/660
x = 1560
x = 1560
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