(2,7х-15)-(3,1х-14)=2,7х-15-3,1х+14=(2,7х-3,1х)+(-15+14)=-0,4х-1
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(2,7х-15)-(3,1х-14)=2,7х-15-3,1х+14=(2,7х-3,1х)+(-15+14)=-0,4х-1