18/х-20 = 20/х-18
18(х-18) = 20(х-20)
18х-324 = 20х-400
18х-20х = -400+324
-2х = -76
х = 38
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18/х-20 = 20/х-18
18(х-18) = 20(х-20)
18х-324 = 20х-400
18х-20х = -400+324
-2х = -76
х = 38