-х=3/10+1/6-7/30
-х=9/30+5/30-7/30
-х=7/30
Х=-7/30
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-х=3/10+1/6-7/30
-х=9/30+5/30-7/30
-х=7/30
Х=-7/30
-х=3/10-1/15
-х=7/30
х=-7/30