45/140 - х = 12/140+ 21/140
45/140 - х = 33/140
х = 45/140 - 33/140
х = 12/140
________________________
45/140 - 12/140 = 12/140 + 21/140
33/140 = 33/140
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45/140 - х = 12/140+ 21/140
45/140 - х = 33/140
х = 45/140 - 33/140
х = 12/140
________________________
45/140 - 12/140 = 12/140 + 21/140
33/140 = 33/140