(5+7с)×15=-30
5×15=75
7с×15=105с
75+105с=-30
105с=-30-75
105с=-105
с=-105÷105
с=-1
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75+105с=-30
105с=-30-75
105с=-105
с=-1
(5+7с)×15=-30
5×15=75
7с×15=105с
75+105с=-30
105с=-30-75
105с=-105
с=-105÷105
с=-1