6.5c+30-6.5c-71
2.7d-7,5-5d+7.5
6,5с+30-6,5с-71=-39 2,7d-7,5-5d+7,5=-2,3d
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6,5с+30-6,5с-71=-39 2,7d-7,5-5d+7,5=-2,3d