10/30х+6/30х+5/30х=21/40
21/30х=21/40
Х=21/40:21/30=21/40*30/21
Х=3/4
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10/30х+6/30х+5/30х=21/40
21/30х=21/40
Х=21/40:21/30=21/40*30/21
Х=3/4