18/30-х=4/30+6/30
18/30-х=10/30
Х=18/30-10/30
Х=8/30
18/30-8/30=4/30+6/30
10/30=10/30
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18/30-х=4/30+6/30
18/30-х=10/30
Х=18/30-10/30
Х=8/30
18/30-8/30=4/30+6/30
10/30=10/30