Решить наиболее удобным способом
3+6+9+12+15+18+21+24
___________________________________ =
1+5+9+13+17+21+25+29
_ это дробная черта
6+8+10+12+14+16+18+20+22+24
______________________________________=
3+5+7+9+11+13+15+17+19+21

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