6х+6х+3х+5х=80
20х=80
х=4
1 ст=24
2 ст=12
3 ст=24
4 стр= 20
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6х+6х+3х+5х=80
20х=80
х=4
1 ст=24
2 ст=12
3 ст=24
4 стр= 20